On 18/02/17 22:56, Chris Green wrote: > The older (2.9.6) and newer (3.1.0) postfix versions that I'm using > are connecting to the same smarthost. I don't seem to be able to > connect from the 3.1.0 version to the submission service on 587 for > some reason.
At a WAG you have smtp_tls_wrappermode set to yes. Wrappermode is for SMTPS only and does not work for STARTTLS so you need to remove that setting. At a guess you probably also set it to yes in your postfix 2.9 but that setting is not supported in 2.9 so it is simply ignored and wrappermode is not set. > Is it that 'smtp_tls_wrappermode = yes' that I need to remove? I can > see little other difference between the configurations. Correct. Note that SMTPS (port 465) requires wrappermode (not supported in 2.9) or tunnelling through stunnel. STARTTLS (587) requires that wrappermode not be set. Peter
