Mailrelay: wait for downstream response

2020-10-01 Thread lucas2
Hello, I am managing a Postfix mail relay service in our internal network. The relay itself is more permissive than the downstream SMTP server. So it is possible, and indeed it regularly happens, that my relay accepts a message which is subsequently bounced by the downstream server. There is no

Re: Replace semicolon in recipient list

2019-10-23 Thread lucas2
So, you could rewrite the "To:" list into "," separated. That sounds like what I am looking for, thanks! How do I do that? I did not get it to work with a REPLACE in the header_checks...

Re: Replace semicolon in recipient list

2019-10-23 Thread lucas2
I was just curious, why the From addr is a list of addresses? Isn't from just a single address? My bad - I meant to say the "To:" header! Thanks

Replace semicolon in recipient list

2019-10-23 Thread lucas2
Hello Group, I have configured Postfix as a relay to forward all messages to the AWS SES mail service. One sending application is sending mail with a From: header containing a semicolon-separated list of addresses. This is not according to the standard

Re: Remove duplicate header 'MIME-Version'

2019-10-22 Thread lucas2
Wietse Venema schreef op 21-10-2019 18:10: You can remove all MIME-Version headers with the header_checks IGNORE action (header_checks has no counter). But that will almost certainly break signed messages (DKIM/DMARC). Thank you. The clients are quite outdated (which is why they don't use

Remove duplicate header 'MIME-Version'

2019-10-21 Thread lucas2
Hello Group, I have configured Postfix as a relay to forward all messages to the AWS SES mail service. SES bounces some messages with the following error: status=bounced (host email-smtp.eu-west-1.amazonaws.com[52.48.248.62] said: 554 Transaction failed: Duplicate header 'MIME-Version'. (in

DMARC mitigation for mailing list server

2019-03-26 Thread lucas2
Hi List, I am running a mailing list server using the ListServ software. List members can send a message to a list, and the software essentially forwards the message to the entire list, using the following headers:     Sender:     From: I use my own Postfix implementation as SMTP server to

Can the "From:" and "Sender:" headers be swapped?

2016-12-06 Thread lucas2
Hi List, I am running an application which is sending mail through Postfix containing both a "From:" and a "Sender:" header. For one specific address in "Sender:", I would like to swap the values for "From:" and "Sender:". For example: The application dispatches a message From: