Hi Stefano, thanks for the informations, now I tried to set a specific transport on Postfix for IOL domains (blu.it, inwind.it, iol.it, libero.it and virgilio.it). For that transport, I configured "destination_concurrency_limit = 1" and I removed the delay. Do you think it might be ok?
Yahoo seems to be working at the moment. To be careful, I'll try to configure the retry time as you suggested. Thanks, Claudio Da: "Stefano Bagnara" <mai...@bago.org> A: mailop@mailop.org Cc: "Claudio Faoro" <c.fa...@bbbell.it> Inviato: Giovedì, 4 aprile 2024 10:38:59 Oggetto: Re: [mailop] Delivery issues with libero.it / virgilio.it (IOL) Hi Claudio, About Libero (IOL) try to use a single connection. I got that error by using 2 concurrent connections from the same IP: you can send very fast but you can only use a single connection. I've never been able to get in touch with a Libero postmaster recently. About Yahoo from what I saw they have an hourly rate limiting that is being reset at the 30 minute of each hour and a daily limit that resets at 3 in the night (CET): the 2 limits depend on your IP reputation, so you can try delaying 1 hour for the first retries and 1 day for the next ones, until yahoo learn your IP reputation. Yahoo postmaster is here in the list. Stefano On Thu, 4 Apr 2024 at 01:07, Claudio Faoro via mailop <mailop@mailop.org> 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 -- Stefano Bagnara Apache James/jDKIM/jSPF VOXmail/Mosaico.io/VoidLabs
_______________________________________________ mailop mailing list mailop@mailop.org https://list.mailop.org/listinfo/mailop
