On 24/06/2026 18:31, Nick Tait via Postfix-users wrote:
On 24/06/2026 10:40, David Koski via Postfix-users wrote:
Hello,
I'm looking for a way to restrict a single user to sending only to a
single domain.
Regards,
David Koski
[email protected]
Hi David.
Assuming that you want to allow [email protected] to only
send to [email protected], then you should be able to do
something like this:
smtpd_recipient_restrictions = check_sender_access inline:{
{[email protected] = check_recipient_access inline:{
{[email protected] = ok } }, reject } }
Nick.
My apologies. I neglected to account for the restrictions documented
here: https://www.postfix.org/RESTRICTION_CLASS_README.html
The correct configuration would be something like this instead (NB:
"..." represents the current setting that you have in your configuration):
smtpd_restriction_classes = check_restricted_senders,
check_restricted_senders_allowed_recipients
check_restricted_senders = check_sender_access
inline:{[email protected]=check_restricted_senders_allowed_recipients
}
check_restricted_senders_allowed_recipients = check_recipient_access
inline:{[email protected]=ok }, reject
smtpd_recipient_restrictions = ..., check_restricted_senders
mua_sender_restrictions = ..., check_restricted_senders
BTW The last line is only needed if your master.cf contains the
following parameter specified for "submission" or "submissions" service:
-o smtpd_sender_restrictions=$mua_sender_restrictions
Nick.
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