For the past couple of days, I have been getting the following errors when
trying to relay mail via mail.synchro.net.

0036 SEND/TLS [mail.synchro.net] WARNING 'Bad/unrecognized data format' (-32)
setting session active
1/31 11:02:38 mail 0036 SEND connecting to port 587 on mail.synchro.net
[71.95.196.36]
1/31 11:02:38 mail 0036 SEND !INVALID RESPONSE: '421 System Error: Maximum
connections exceeded, try again later' Expected: '220'
1/31 11:02:38 mail 0036 SEND mail.synchro.net replied with: "421 System Error:
Maximum connections exceeded, try again later" instead of the expected reply:
"220 ..."

The system tries again later and gets the same response. Could there be a
boo-boo on my end that is causing that response, or is it something going on
at the server end?

Thanks!

* SLMR 2.1a * How do they get the deer to cross at the signs?

---
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Re: email relay error
By: Dumas Walker to DIGITAL MAN on Wed Jan 31 2024 11:30 am

> For the past couple of days, I have been getting the following errors when
> trying to relay mail via mail.synchro.net.
>
> 0036 SEND/TLS [mail.synchro.net] WARNING 'Bad/unrecognized data format'
> (-32) setting session active
> 1/31 11:02:38 mail 0036 SEND connecting to port 587 on mail.synchro.net
> [71.95.196.36]
> 1/31 11:02:38 mail 0036 SEND !INVALID RESPONSE: '421 System Error: Maximum
> connections exceeded, try again later' Expected: '220'
> 1/31 11:02:38 mail 0036 SEND mail.synchro.net replied with: "421 System
> Error: Maximum connections exceeded, try again later" instead of the
> expected reply: "220 ..."
>
> The system tries again later and gets the same response. Could there be a
> boo-boo on my end that is causing that response, or is it something going on
> at the server end?

I was probably just under a botnet attack at that time. I have my SMTP[S] server set to 100 clients, which is normally plenty, but the botnets can time connect thousands of a clients at a time (or try to), thus starving out legit clients. Just try again, it looks fine right now.
--
digital man (rob)

Breaking Bad quote #28:
Gomey, got beat your pinata. - Hank Schrader
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---
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> > The system tries again later and gets the same response. Could there be a
> > boo-boo on my end that is causing that response, or is it something going o
> > at the server end?

> I was probably just under a botnet attack at that time. I have my SMTP[S] serv
> set to 100 clients, which is normally plenty, but the botnets can time connec
> thousands of a clients at a time (or try to), thus starving out legit clients.
> ust try again, it looks fine right now.

Thanks. I have had some issues with them lately also, but not to near that
volume. I will watch it and see if the mail is still stuck.

* SLMR 2.1a * "I'm sick! I ought to be home in bed with a nurse."

---
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> > > The system tries again later and gets the same response. Could there
> > > be a boo-boo on my end that is causing that response, or is it
> > > something going o
> > > at the server end?

> > I was probably just under a botnet attack at that time. I have my SMTP[S]
> > serv
> > set to 100 clients, which is normally plenty, but the botnets can time
> > connec
> > thousands of a clients at a time (or try to), thus starving out legit
> > clients.
> > ust try again, it looks fine right now.

> Thanks. I have had some issues with them lately also, but not to near that
> volume. I will watch it and see if the mail is still stuck.

Nope. Mail is still stuck.

#

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Re: Re: email relay error
By: Dumas Walker to Digital Man on Thu Feb 01 2024 10:24 am

> Nope. Mail is still stuck.

Can you elaborate?

mail.synchro.net seems to be accepting incoming connections just fine right now:
$ nc mail.synchro.net 25
220 cvs.synchro.net Synchronet SMTP Server 3.20a-Linux Ready
--
digital man (rob)

Rush quote #20:
Learning that we're only immortal, for a limited time
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Re: Re: email relay error
By: Digital Man to Dumas Walker on Thu Feb 01 2024 11:48 am

>> Nope. Mail is still stuck.

DM> Can you elaborate?

DM> mail.synchro.net seems to be accepting incoming connections just fine
DM> right now: $ nc mail.synchro.net 25

ive been getting errors too, just recieved "error 421, maximum connections exceeded, try later" when connection to you server. its been trying with an email I sent earlier this morning.

....Immortality consists largely of boredom. Zefrem Cochrane, stardate 3219.8.

---
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Re: Re: email relay error
By: kk4qbn to Digital Man on Thu Feb 01 2024 06:59 pm

> Re: Re: email relay error
> By: Digital Man to Dumas Walker on Thu Feb 01 2024 11:48 am
>
> >> Nope. Mail is still stuck.
>
> DM> Can you elaborate?
>
> DM> mail.synchro.net seems to be accepting incoming connections just fine
> DM> right now: $ nc mail.synchro.net 25
>
> ive been getting errors too, just recieved "error 421, maximum connections
> exceeded, try later" when connection to you server. its been trying with an
> email I sent earlier this morning.

What IP address are you connecting from?
--
digital man (rob)

Synchronet "Real Fact" #89:
Rob played drums on the LP "Weedpuller" available for digital purchase/stream
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Re: Re: email relay error
By: Digital Man to kk4qbn on Thu Feb 01 2024 11:55 pm

DM> What IP address are you connecting from?

174.80.5.232

---
■ Synchronet ■ KK4QBN BBS - kk4qbn.synchro.net - Chatsworth, GA USA

> > Nope. Mail is still stuck.

> Can you elaborate?

"Stuck" means that the first couple of messages you see in these errors have
been waiting several days to be sent.

2/2 09:52:14 mail 0094 SEND connecting to port 587 on mail.synchro.net
[71.95.196.36]
2/2 09:52:16 mail 0094 SEND/TLS [mail.synchro.net] WARNING 'Bad/unrecognized
data format' (-32) setting session active
2/2 09:52:16 mail 0094 SEND connecting to port 587 on mail.synchro.net
[71.95.196.36]
2/2 09:52:16 mail 0094 SEND !INVALID RESPONSE: '421 System Error: Maximum
connections exceeded, try again later' Expected: '220'
2/2 09:52:16 mail 0094 SEND mail.synchro.net replied with: "421 System Error:
Maximum connections exceeded, try again later" instead of the expected reply:
"220 ..."
2/2 09:52:16 mail 0094 SEND !Delivery attempt #36 FAILED (mail.synchro.net
replied with: "421 System Error: Maximum connections exceeded, try again later"
instead of the expected reply: "220 ...") for message #3838 from Dave
Weissinger to redacted.com
2/2 09:52:16 mail 0000 SEND Message #3840 (243 of 246) from 'Mike Powell' #1
to 'CCOKY' <redacted>
2/2 09:52:16 mail 0094 SEND connecting to port 587 on mail.synchro.net
[71.95.196.36]
2/2 09:52:16 mail 0094 SEND !INVALID RESPONSE: '421 System Error: Maximum
connections exceeded, try again later' Expected: '220'
2/2 09:52:16 mail 0094 SEND mail.synchro.net replied with: "421 System Error:
Maximum connections exceeded, try again later" instead of the expected reply:
"220 ..."
2/2 09:52:16 mail 0094 SEND !Delivery attempt #26 FAILED (mail.synchro.net
replied with: "421 System Error: Maximum connections exceeded, try again later"
for message #3840 from Mike Powell to redacted.COM
2/2 09:52:16 mail 0000 SEND Message #3841 (244 of 246) from 'Mike Powell' #1
to 'CCOKY' <redacted>
2/2 09:52:16 mail 0094 SEND connecting to port 587 on mail.synchro.net
[71.95.196.36]
2/2 09:52:16 mail 0094 SEND !INVALID RESPONSE: '421 System Error: Maximum
connections exceeded, try again later' Expected: '220'
2/2 09:52:16 mail 0094 SEND mail.synchro.net replied with: "421 System Error:
Maximum connections exceeded, try again later" instead of the expected reply:
"220 ..."
2/2 09:52:16 mail 0094 SEND !Delivery attempt #20 FAILED (mail.synchro.net
replied with: "421 System Error: Maximum connections exceeded, try again later"
instead of the expected reply: "220 ...") for message #3841 from Mike Powell
to redacted.COM
2/2 09:52:16 mail 0000 SEND Message #3843 (246 of 246) from 'Mike Powell' #1
to 'ccoky' <redacted>
2/2 09:52:16 mail 0094 SEND connecting to port 587 on mail.synchro.net
[71.95.196.36]
2/2 09:52:17 mail 0094 SEND !INVALID RESPONSE: '421 System Error: Maximum
connections exceeded, try again later' Expected: '220'
2/2 09:52:17 mail 0094 SEND mail.synchro.net replied with: "421 System
Error: Maximum connections exceeded, try again later" instead of the expected
reply: "220 ..."
2/2 09:52:17 mail 0094 SEND !Delivery attempt #1 FAILED (mail.synchro.net
replied with: "421 System Error: Maximum connections exceeded, try again later"
instead of the expected reply: "220 ...") for message #3843 from Mike Powell to
redacted.com

> mail.synchro.net seems to be accepting incoming connections just fine right no
> $ nc mail.synchro.net 25
> 220 cvs.synchro.net Synchronet SMTP Server 3.20a-Linux Ready

Note that I am, and have been, sending to port 587 instead of 25 because my
ISP blocks all outbound port 25 traffic. I thought I should mention that
as your 'nc' output above is to port 25.

My IPA is 67.131.57.133. Thanks!

* SLMR 2.1a * Rate yourself as a programmer on a scale of 0 to F.

---
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Re: Re: email relay error
By: kk4qbn to Digital Man on Fri Feb 02 2024 08:13 am

> Re: Re: email relay error
> By: Digital Man to kk4qbn on Thu Feb 01 2024 11:55 pm
>
> DM> What IP address are you connecting from?
>
> 174.80.5.232

Looks like my mail server is getting multiple concurrent connections from that IP without a successful authentication:

2024-02-01T18:52:50.703533-08:00 git sbbs: mail 0860 SMTPS [174.80.5.232] ERROR 'Received TLS alert message: Handshake failure' (-15) setting session active
2024-02-01T18:52:50.703598-08:00 git sbbs: mail 0860 SMTP [174.80.5.232] Session thread terminated (3 threads remain, 8710 clients served)

Are you running multiple instances of SBBS or some other mail server that's trying to send at the same time as Synchronet sendmail thread? The Synchronet sendmail thread is a single thread that seconds a single email at a time over a single TCP connection, so it seems there's something going on here weird from your end maybe.
--
digital man (rob)

Synchronet "Real Fact" #105:
Synchronet YouTube channel: https://www.youtube.com/c/Synchronet
Norco, CA WX: 54.8°F, 73.0% humidity, 8 mph W wind, 0.29 inches rain/24hrs
---
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Re: Re: email relay error
By: Dumas Walker to DIGITAL MAN on Fri Feb 02 2024 10:14 am

> My IPA is 67.131.57.133. Thanks!

Thanks. Looks to be a recent regression with SMTPS support either on the sending (Synchronet sendmail thread) side or the SMTP server side. I assume you've updated from git fairly recently?
--
digital man (rob)

Synchronet/BBS Terminology Definition #53:
MQTT = Message Queue Telemetry Transport Protocol
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Re: Re: email relay error
By: Digital Man to kk4qbn on Fri Feb 02 2024 11:28 am

> Are you running multiple instances of SBBS or some other mail server that's
> trying to send at the same time as Synchronet sendmail thread? The
> Synchronet sendmail thread is a single thread that seconds a single email at
> a time over a single TCP connection, so it seems there's something going on
> here weird from your end maybe.

Since there's at least one other sysop with the same/similar issue, I think it's a regression in the SMTPS support, probably on the sendmail thread side. I'm conferring with Deuce about it.
--
digital man (rob)

Synchronet "Real Fact" #55:
Synchronet Terminal Server introduced RLogin support w/v3.00c (2000)
Norco, CA WX: 56.4°F, 69.0% humidity, 3 mph SW wind, 0.26 inches rain/24hrs
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Re: Re: email relay error
By: Digital Man to kk4qbn on Fri Feb 02 2024 11:28 am

> DM>> What IP address are you connecting from?

>> 174.80.5.232

DM> Looks like my mail server is getting multiple concurrent connections from
DM> that IP without a successful authentication:

DM> 2024-02-01T18:52:50.703533-08:00 git sbbs: mail 0860 SMTPS [174.80.5.232]
DM> ERROR 'Received TLS alert message: Handshake failure' (-15) setting
DM> session active 2024-02-01T18:52:50.703598-08:00 git sbbs: mail 0860 SMTP
DM> [174.80.5.232] Session thread terminated (3 threads remain, 8710 clients
DM> served)
DM> Are you running multiple instances of SBBS or some other mail server

Nope, no other mailservers whatsoever, I'm sure i'm not running multiple instances of sbbs, just started running under systemd, so still learning the ins and outs of it, but I'm sure it has'nt sprung 2 instances of it up :-)

here is the log entry to match yours:

2024-02-01T18:52:37.676131-05:00 kk4qbn synchronet: mail 0000 SEND Message #256 (3 of 4) from 'kk4qbn' #1 to 'XXXXXXXXX' <XXXXXXXXX@comcast.net>
2024-02-01T18:52:37.888227-05:00 kk4qbn synchronet: mail 0078 SEND connecting to port 25 on mail.synchro.net [71.95.196.36]
2024-02-01T18:52:42.199734-05:00 kk4qbn synchronet: mail 0078 SEND/TLS [mail.synchro.net] WARNING 'Bad/unrecognized data format' (-32) setting session active
2024-02-01T18:52:42.200133-05:00 kk4qbn synchronet: mail 0078 SEND connecting to port 25 on mail.synchro.net [71.95.196.36]
2024-02-01T18:52:42.396033-05:00 kk4qbn synchronet: mail 0078 SEND !INVALID RESPONSE: '421 System Error: Maximum connections exceeded, try again later' Expected: '220'

Thanks!

....Please don't ask me what the score is. I'm not even sure what the game is.

---
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Re: Re: email relay error
By: Digital Man to kk4qbn on Fri Feb 02 2024 12:15 pm

>> Are you running multiple instances of SBBS or some other mail server that's
>> trying to send at the same time as Synchronet sendmail thread? The
>> Synchronet sendmail thread is a single thread that seconds a single email

DM> Since there's at least one other sysop with the same/similar issue, I
DM> think it's a regression in the SMTPS support, probably on the sendmail
DM> thread side. I'm conferring with Deuce about it.

Cool, thanks. still checking on my end for mistakes, usually in my case its and issue of operator error over anything else :)

....Blessed are the meek for they shall inherit the crap.

---
■ Synchronet ■ KK4QBN BBS - kk4qbn.synchro.net - Chatsworth, GA USA

> Thanks. Looks to be a recent regression with SMTPS support either on the sendi
> (Synchronet sendmail thread) side or the SMTP server side. I assume you've up
> ted from git fairly recently?

No actually I have not. I am still running 3.19.

I also received this email from VERT:

> vert.synchro.net reporting delivery failure of message after 51 attempts
> from Mike Powell to CCOKY@ILGOU.COM

> Reason:
> ERROR 10061 connecting to SMTP server: ILGOU.COM

* SLMR 2.1a * As confused as a baby at a topless bar.

---
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-=> Digital Man wrote to Dumas Walker <=-

DM> I was probably just under a botnet attack at that time. I have my
DM> SMTP[S] server set to 100 clients, which is normally plenty, but the
DM> botnets can time connect thousands of a clients at a time (or try to),
DM> thus starving out legit clients. Just try again, it looks fine right
DM> now. --

I thought they al gave up and opened outlook.com addresses - at least
all of the spams I see look to come from Microsoft...

.... "He who is without oil, shall cast the first rod."-Compressions 8.7:1.
--- MultiMail/Win v0.52
� Synchronet � .: realitycheckbbs.org :: scientia potentia est :.

Re: Re: email relay error
By: Dumas Walker to DIGITAL MAN on Sat Feb 03 2024 10:13 am

> No actually I have not. I am still running 3.19.

Okay, thanks, that's good to know.
--
digital man (rob)

Sling Blade quote #1:
Karl: I've killed Doyle with a lawn mower blade. Yes, I'm right sure of it.
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Re: Re: email relay error
By: poindexter FORTRAN to Digital Man on Fri Feb 02 2024 06:29 am

>
> I thought they al gave up and opened outlook.com addresses - at least
> all of the spams I see look to come from Microsoft...
>
>

yeah, sure.
---
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Re: Re: email relay error
By: Digital Man to Dumas Walker on Sat Feb 03 2024 12:11 pm

> Re: Re: email relay error
> By: Dumas Walker to DIGITAL MAN on Sat Feb 03 2024 10:13 am
>
> > No actually I have not. I am still running 3.19.
>
> Okay, thanks, that's good to know.

I've increased the max concurrent connections to 2 at mail.synchro.net, so that should resolve the issue.
--
digital man (rob)

Sling Blade quote #4:
Doyle: wimpy-ass kids or mental retards.. she got one of each livin' with her.
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Re: Re: email relay error
By: Digital Man to Dumas Walker on Sat Feb 03 2024 03:18 pm

DM> I've increased the max concurrent connections to 2 at mail.synchro.net, so
DM> that should resolve the issue. --

Seems to have fixed it! Mail is getting out for me now.

|01<|09co|03d|11e|15ƒ|11e|03n|09ix|01>|07

....If you've got them by the balls, their hearts and minds will follow.
---
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> > Re: Re: email relay error
> > By: Dumas Walker to DIGITAL MAN on Sat Feb 03 2024 10:13 am
> >
> > > No actually I have not. I am still running 3.19.
> >
> > Okay, thanks, that's good to know.

> I've increased the max concurrent connections to 2 at mail.synchro.net, so tha
> should resolve the issue.

It looks like it has. Thanks!

* SLMR 2.1a * If you believe in telekinesis, please raise my hand.

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