On 19/01/2026 19:27, Dennis Putnam via Postfix-users wrote:
On 1/19/2026 11:11 AM, John Fawcett via Postfix-users wrote:
On 19/01/2026 16:46, Dennis Putnam via Postfix-users wrote:
I have a situation where I need to use different relay logins to the
same host depending on the local sender. For example:
If the local user is [email protected] the the relay host login
needs to be [email protected].
However, if the local user is [email protected] then the relay host
login needs to be [email protected].
It seems that relay_sender only maps to one login:
[email protected] [smtp.relay.com]:587
[email protected] [smtp.relay.com]:587
And of course in sasl_password:
[smtp.relay.com]:587 uuuuuu:keystring
[smtp.relay.com]:587 xxxx:anotherkeystring
Is there not a way to distinguish which login to use in this case?
If so, how? TIA
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Hi Dennis
I saw a section here on how to configure a sender dependent SASL
authentication:
https://www.postfix.org/SASL_README.html
using smtp_sender_dependent_authentication
John
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Hi John,
Thanks for the reply. I thought I did what was documented but it does
not work for me. Authentication fails. The same authentication works
if I don't use like originally posted:
smtp_sender_dependent_authentication = yes
Here's what I did:
sender_relay
[email protected] [smtp.relay.com]:587
[email protected] [smtp.relay.com]:587
sasl_passwd
[email protected] [email protected]:keystring
[email protected] [email protected]:anotherkeystring
# default authentication
[smtp.myisp.net]:587 [email protected]:differentkeystring
According to the postfix log, it is trying to use relay.com but
authentication is failing. I can't tell which from the log but neither
works when commenting one or the other out. I am guessing that I am
doing something wrong with the syntax in sasl_passwd but I don't see
what. The default authentication works.
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I'm not really sure I understood all your configuration. Is it possible
to post it with only obscuring the passwords and the domains as well as
postconf -n and any logging from the message sending. I am assuming that
you have postmapped the hash maps and reloaded postfix for your tests.
I am pretty sure that the example in the docs is valid.
John
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