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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