Re: Tweak Postfix so that it will resend emails after the initial 451 response
jan gestre: us...@former.sample: host webmail.former.sample[210.21x.xx.xx] said: 451 Temporary failure, please try again later. (in reply to DATA command) Postfix always resends after 451, but it stops when the message is too old (the default limits are: maximal_queue_lifetime = 5d and bounce_queue_lifetime = 5d). The maillog file will show how long Postfix has been retrying deliveries. Wietse
Tweak Postfix so that it will resend emails after the initial 451 response
Hi Guys, I have a Postfix server behind a gateway firewall that does content filtering (SpamD on pfSense) and greylisting and we have an application server that uses Postfix as its MTA, the problem is after the initial 451 response the latter quits and send an Undeliverable Mail to sender, what changes needs to be done on the latter in order for it to resend email successfully, I don't have a problem with other third party mail server except for this one. Since I don't have access to the latter I can't provide any logs except for the following: --- This is the Postfix program at host mail.latter.sample. I'm sorry to have to inform you that the message returned below could not be delivered to one or more destinations. For further assistance, please send mail to postmaster If you do so, please include this problem report. You can delete your own text from the message returned below. The Postfix program us...@former.sample: host webmail.former.sample[210.21x.xx.xx] said: 451 Temporary failure, please try again later. (in reply to DATA command) TIA.
Re: Tweak Postfix so that it will resend emails after the initial 451 response
2009/11/23 jan gestre ipcopper...@gmail.com: I have a Postfix server behind a gateway firewall that does content filtering (SpamD on pfSense) and greylisting and we have an application server that uses Postfix as its MTA, the problem is after the initial 451 response the latter quits and send an Undeliverable Mail to sender, what changes needs to be done on the latter in order for it to resend email successfully, I don't have a problem with other third party mail server except for this one. Since I don't have access to the latter I can't provide any logs except for the following: --- This is the Postfix program at host mail.latter.sample. I'm sorry to have to inform you that the message returned below could not be delivered to one or more destinations. For further assistance, please send mail to postmaster If you do so, please include this problem report. You can delete your own text from the message returned below. The Postfix program us...@former.sample: host webmail.former.sample[210.21x.xx.xx] said: 451 Temporary failure, please try again later. (in reply to DATA command) It sounds like your application server isn't doing the right thing. The 451 error code indicates a temporary error, and that the sender should try again later. If it doesn't retry, that is the sender's fault, it's not following the spec. The best solution is to fix the sender. An alternative would be to whitelist the sender on the Postfix box. As you say, you don't have access, perhaps you can try contacting whoever administers the server. Greylisting is an anti-spam measure (ie. incoming mail). Your mail sounds like it's outgoing, so it shouldn't be unreasonable to get whitelisted.
