Hi Wietse, That fixed it.
Thank you for helping me out. It was a custom written content filter built with python. The python modules defaulted to 32M size. On Mon, Sep 8, 2025 at 10:08 PM Wietse Venema via Postfix-users < [email protected]> wrote: > Kladizkov theone via Postfix-users: > > Hello there, > > > > I?m running Postfix and have configured a custom content filter on > > localhost ( a python service that listens at 10025 ). When sending large > > messages, Postfix rejects them with the following error: > > > > message size 34639078 exceeds size limit 33554432 of server > localhost[127.0.0.1] > > The SMTP-based content filter server announces a SIZE limit of 33554432. > If that is not the limit that you need. change the content filter. > > Assuming this is the setup: > > upstream Postfix SMTP client -> content filter -> donwstream Postfix SMTP > serer > > You can test this by hand with > > telnet localhost port-of-content-filter > > ehlo localhost > > The filter will announce SIZE=33554432 > > Some content filters will announce the SIZE limit from the down-stream > Postfix SMTP server. In that case, you need to change the settings > there. > > You can test this by hand with > > telnet localhost port-of-downstream-smtp-server > > ehlo localhost > > And verify that this announces the SIZE= value that > you expect Postfix to use. > > Wietse > _______________________________________________ > Postfix-users mailing list -- [email protected] > To unsubscribe send an email to [email protected] >
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