>>>> I've been using smtps on port 465 for sending mail but I read it's >>>> deprecated so I'm trying to switch to submission port 587. >>>> >>>> With 465 I was using the "Connection security: SSL/TLS" setting in >>>> Thunderbird, but after switching to 587 I can't send mail unless I >>>> change it to STARTTLS. Can anyone explain this? >>> >>> yes because it is STARTTLS >>> 465 is smtp over ssl and NOT STARTTLS >>> >>> we provide both on smtp/imap/pop3 because all of them >>> having a dedicated "over ssl" port and STARTTLS over >>> the standard-port if configured >>> >>> SMTP unencrypted / TLS: 587 >>> SMTP over SSL: 465 >>> POP3 unencrypted / TLS: 110 >>> POP3 over SSL: 995 >>> IMAP unencrypted / TLS: 143 >>> IMAP over SSL: 993 >> >> Is IMAP over SSL on 993 deprecated in favor of using STARTTLS on 143? > > i do not know, but i see no reason to disable the dedicated ssl-ports
Are you saying I should continue using smtps port 465 even though it's deprecated? >> I just read that Squirrelmail doesn't support STARTTLS, so I must >> continue to use smtps 465 in order to use Squirrelmail? > > the main-question is why you need to encrypt sending messages from > a webmail which usually does not go over the WAN If I set "Secure SMTP (TLS) : false" in squirrelmail, I get: Authentication required 530 5.7.0 Must issue a STARTTLS command first If I change port 587 to 25 in squirrelmail I get: Bad sequence of commands 503 5.5.1 Error: authentication not enabled - Grant
