The "STARTTLS is not allowed for" is only in 2.6.5.21074, I reverted to
2.6.3.20002 and that issue goes away, but the first issue remains. I
can try reverting to another version prior to that.

Outlook IPv4, the other was Gmail/Google IPv6, same issue

Aug  2 11:45:39 mail2 assp.pl[15632]: [Worker_4] [TLS-in] [TLS-out]
40.107.93.46 TLS-Connection idle for 180 secs - timeout
Aug  2 11:45:39 mail2 assp.pl[15632]: [Worker_4] [TLS-in] [TLS-out]
40.107.93.46 [SMTP Status] 451 Connection timeout, try later
Aug  2 11:45:39 mail2 assp.pl[15632]: [Worker_4] [TLS-in] [TLS-out]
40.107.93.46 disconnected: session:7FF31088DA20 40.107.93.46 -
processing time 0 seconds

On Mon, 2 Aug 2021 14:19:40 -0400
"William L. Thomson Jr." <wlt...@o-sinc.com> wrote:

> This is affecting me as well...
> 
> On Fri, 30 Jul 2021 14:57:45 +0200
> Thomas Eckardt <thomas.ecka...@thockar.com> wrote:
> 
> > >something must changed in ssl/tls or in postfix. ....
> > 
> > http://postfix.cs.utah.edu/source/official/postfix-3.4.1.RELEASE_NOTES
> > 
> > Yes, there are many SSL/TLS related changes in the last postfix
> > releases.
> 
> I do not use postfix, I run qmail instead. I am having major issues
> with Gmail, eBay, Outlook, Amazon, and many others. It looks like it
> might be something related to gray listing, as the error code is 451
> for both. Gmail showed this error
> 
> "451 connection timeout, try again later"
> 
> That comes straight from the logs
> 
> Aug  2 13:57:13 mail assp.pl[21426]: [Worker_4] [TLS-in] [TLS-out]
> 2607:f8b0:4864:20::b30 TLS-Connection idle for 180 secs - timeout
> Aug 2 13:57:13 mail assp.pl[21426]: [Worker_4] [TLS-in] [TLS-out]
> 2607:f8b0:4864:20::b30 [SMTP Status] 451 Connection timeout, try later
> Aug  2 13:57:13 mail assp.pl[21426]: [Worker_4] [TLS-in] [TLS-out]
> 2607:f8b0:4864:20::b30 disconnected: session:7F3EBD76F4B8
> 2607:f8b0:4864:20::b30 - processing time 0 seconds
> 
> For another I got this
> 
> Aug  2 13:23:00 mail assp.pl[21426]: [Worker_4] 185.55.116.145 info:
> got STARTTLS request from 185.55.116.145
> Aug  2 13:23:00 mail assp.pl[21426]:
> [Worker_4] 185.55.116.145 info: STARTTLS is not allowed for
> 185.55.116.145
> Aug  2 13:23:00 mail assp.pl[21426]: [Worker_4] 185.55.116.145 [SMTP
> Error] 502 command not implemented or not allowed to be used by
> 185.55.116.145
> Aug 2 13:23:00 mail assp.pl[21426]: [Worker_4] IPv4/IPv6 disconnected:
> session:7F3EBC83AC78 185.55.116.145 - processing time 0 seconds
> 
> Those might be unrelated. Not sure why STARTTLS is not available for
> some IPv4/IPv6 addresses, but works fine for others. The above was the
> same regardless of IPv4 or IPv6.
> 
> Either way, the issue is the same, the senders email server sees
> connection issue and assumes the server is unreachable. A lot of email
> is not arriving as a result.
> 



-- 
William L. Thomson Jr.


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