Re: Relaying fails but sending is deferred instead of bouncing mail
* Jean-Sébastien Kroll-Rabotin j...@no-log.org: Hi, When my Postfix server sends some mail from addresses in the local domain, permanent errors (5XX) are treated as temporary errors (4XX) and mail is delayed while it should definitely fail. From your logs I cannot see WHEN (at which stage of the SMTP dialoge) the rejection occurs. I think the rejection occurs immediately (before the HELO) Try: smtp_skip_5xx_greeting = no -- Ralf Hildebrandt Geschäftsbereich IT | Abteilung Netzwerk Charité - Universitätsmedizin Berlin Campus Benjamin Franklin Hindenburgdamm 30 | D-12203 Berlin Tel. +49 30 450 570 155 | Fax: +49 30 450 570 962 ralf.hildebra...@charite.de | http://www.charite.de
Re: Relaying fails but sending is deferred instead of bouncing mail
On 4/8/2011 2:45 AM, Ralf Hildebrandt wrote: * Jean-Sébastien Kroll-Rabotinj...@no-log.org: Hi, When my Postfix server sends some mail from addresses in the local domain, permanent errors (5XX) are treated as temporary errors (4XX) and mail is delayed while it should definitely fail. From your logs I cannot see WHEN (at which stage of the SMTP dialoge) the rejection occurs. I think the rejection occurs immediately (before the HELO) Try: smtp_skip_5xx_greeting = no In my experience RBL rejection is quite immediate indeed. Just to source it: [snapshot-2507] For the sake of Sendmail compatibility, the Postfix SMTP client skips over SMTP servers that greet with a 4XX or 5XX reply code, treating them as unreachable servers. To obtain prior behavior (4XX=retry, 5XX=bounce), specify smtp_skip_4xx_greeting = no and smtp_skip_5xx_greeting = no. I imagine the rationale is that if you hit an RBL, it is after all real-time and retrying later MAY work; especially if the admin sees the log and takes immediate corrective measures. I have also had the odd experience where one MX server of a domain has weeks-old RBL cached data and another in the same farm is current so it's worth it for Postfix outbound to consider the MX merely unreachable and to shop around. -Daniel
Re: Relaying fails but sending is deferred instead of bouncing mail
Daniel Bromberg: Just to source it: [snapshot-2507] For the sake of Sendmail compatibility, the Postfix SMTP client skips over SMTP servers that greet with a 4XX or 5XX reply code, treating them as unreachable servers. To obtain prior behavior (4XX=retry, 5XX=bounce), specify smtp_skip_4xx_greeting = no and smtp_skip_5xx_greeting = no. The rationale is that some people actually expect that a 5XX reply on CONNECT means the client should connect to the a backup server instead. Keep in mind that the primary purpose of Postfix is to deliver mail, not to force people to configure the server per the RFC. Wietse
