I have an issue with my system where it is repeatedly issuing 451 delays
to the same email send attempts. I have a customer who receives a lot of
email from a specific company, always coming from the same IP. They are
missing a lot of emails because the sending server gives up after
attempting to resend the same email over and over again.
Looking at my logs, I can see ASSP issuing 451 delays to the same email,
over and over again (IPs and addresses obfuscated). Here's an example
from early this morning:
May-27-21 00:10:59 NB-88658-11507 [Worker_1] [TLS-in] 50.115.000.222
<SRS0+080cfd88caf4c8dd=KV=sender.com=no-reply=29=aphill...@sender.com>
to: [email protected] [SMTP Status] 451 4.7.1 Please try again later
May-27-21 00:35:12 NB-90000-05568 [Worker_1] [TLS-in] 50.115.000.222
<SRS0+080cfd88caf4c8dd=KV=sender.com=no-reply=29=aphill...@sender.com>
to: [email protected] [SMTP Status] 451 4.7.1 Please try again later
May-27-21 01:02:34 NB-91754-05779 [Worker_1] [TLS-in] 50.115.000.222
<SRS0+080cfd88caf4c8dd=KV=sender.com=no-reply=29=aphill...@sender.com>
to: [email protected] [SMTP Status] 451 4.7.1 Please try again later
The sender and recipient are not changing, but ASSP is still delaying it
every time, until the sending server finally gives up.
Here's the whole logged conversation, so you can see there's nothing
else that should be causing it - I think?
May-27-21 01:02:34 [Worker_1] [TLS-in] 50.115.000.222 info: started
TLS-SSL session for client 50.115.000.222 - using TLSv1_2 ,
ECDHE-RSA-AES128-GCM-SHA256
May-27-21 01:02:34 NB-91754-05779 [Worker_1] [TLS-in] 50.115.000.222
<SRS0+080cfd88caf4c8dd=KV=sender.com=no-reply=29=aphill...@sender.com>
info: found message size announcement: 5.74 kByte
May-27-21 01:02:34 NB-91754-05779 [Worker_1] [TLS-in] 50.115.000.222
<SRS0+080cfd88caf4c8dd=KV=sender.com=no-reply=29=aphill...@sender.com>
Message-Score: added -10 (tlsValencePB) for SSL-TLS-connection-OK, total
score for this message is now -10
May-27-21 01:02:34 [Worker_1] [email protected] matches
[email protected] in LocalAddresses_Flat
May-27-21 01:02:34 NB-91754-05779 [Worker_1] [TLS-in] 50.115.000.222
<SRS0+080cfd88caf4c8dd=KV=sender.com=no-reply=29=aphill...@sender.com>
to: [email protected] recipient delayed: [email protected]
May-27-21 01:02:34 NB-91754-05779 [Worker_1] [TLS-in] 50.115.000.222
<SRS0+080cfd88caf4c8dd=KV=sender.com=no-reply=29=aphill...@sender.com>
to: [email protected] [SMTP Status] 451 4.7.1 Please try again later
May-27-21 01:02:34 NB-91754-05779 [Worker_1] [TLS-in] 50.115.000.222
<SRS0+080cfd88caf4c8dd=KV=sender.com=no-reply=29=aphill...@sender.com>
to: [email protected] info: PB-IP-Score for '50.115.179.0' is 0,
added -10 in this session
May-27-21 01:02:34 NB-91754-05779 [Worker_1] [TLS-in] 50.115.000.222
<SRS0+080cfd88caf4c8dd=KV=sender.com=no-reply=29=aphill...@sender.com>
to: [email protected] disconnected: session:C862F7D0 50.115.000.222
- command list was 'EHLO,STARTTLS,EHLO,MAIL FROM,RCPT TO,DATA' - used 6
SocketCalls - processing time 1 seconds
My DelayMD5 is set to on, so I can't view the contents of delaydb to
check it.
Any idea why this might be happening?
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