You do realize you forgot to provide your IP Address ;)
On 4/3/24 15:56, Claudio Faoro via mailop wrote:
Hi everyone,
a couple of weeks ago I configured a new Postfix server, it's used
exclusively by a newsletter service with 20000 subscribers.
The newsletter service has been active for more than 10 years on a very
old server running qmail.
Unfortunately, I had to decommission the old qmail server in a few days,
replacing it with the new one. It was not possible to keep the same IP
address.
I've correctly configured the SPF, DKIM, DMARC and PTR records
(mail-tester.com gives me 10/10).
The first few days, I had problems delivering mail to several providers
due to the amount of messages. I guess it's partly due to the new IP.
For example:
Mar 30 15:37:00 mx1 postfix/smtp[2021]: 6940F7FF09: to=<REDACTED>,
relay=mx-eu.mail.am0.yahoodns.net[188.125.72.74]:25, delay=3473,
delays=0.47/3472/0.71/0.04, dsn=4.7.0, status=deferred (host
mx-eu.mail.am0.yahoodns.net[188.125.72.74] said: 421 4.7.0 [TSS04]
Messages from REDACTED temporarily deferred due to unexpected volume or
user complaints - 4.16.55.1; see
https://postmaster.yahooinc.com/error-codes (in reply to MAIL FROM command))
After a few mailings, the situation seems to have stabilized, Yahoo no
longer gave me problems.
Unfortunately, a good percentage of our subscribers use an email address
from Italiaonline/IOL (libero.it, virgilio.it, iol.it, inwind.it, etc...).
Most of the emails to IOL get bounced:
Mar 30 00:15:40 mx1 postfix/smtp[51700]: 509762617D: to=<REDACTED>,
relay=smtp-in.libero.it[213.209.1.129]:25, delay=116950,
delays=116848/101/0.09/1.1, dsn=4.0.0, status=deferred (host
smtp-in.libero.it[213.209.1.129] said: 451 too many messages, slow down.
[smtp-22.iol.local; LIB_650] (in reply to end of DATA command))
The limit is triggered very quickly and it's removed after several hours.
I tried to throttle the sending to IOL addresses on Postfix
(destination_concurrency_limit = 2 and destination_rate_delay = 300s),
but I keep getting capped after a while.
I don't have much information regarding the old qmail server, but it
seems that there were not all these problems (there wasn't even DKIM and
DMARC configured!).
I don't understand how to resolve these problems with the libero.it
mailboxes (and more generally, with all Italiaonline mailboxes). Do you
have a contact in Italiaonline who can help me?
Any info would help me, thanks in advance.
Regards,
Claudio
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