How do users send mail if Port 25 is blocked?
Users of dynamic ranges with blocked port 25 can connect with SMTP AUTH “SUBMISSION” protocol: ftp://ftp.rfc-editor.org/in-notes/rfc2554.txt. We have more instructions for several other mail programs in the Generic Questions FAQ. What is needed: • The ISP configures its server to accept SMTP AUTH connections on port 587; all modern mail servers support it. Don’t block dynamic users from port 587, and don’t use PBL or Zen on 587 connections! Don’t block your own users! • Each user configures his or her mail client (MUA) to connect via SMTP AUTH on port 587, with username/password. All current MUAs have that as an option; use the mail client’s “help” menu. In Outlook and Outlook Express, the menus for that are something like this:- Internet E-mail Settings – – Outgoing Server – – – [x] My outgoing server (SMTP) requires authentication – Advanced – – Server Port Number – – – Outgoing server (SMTP): [587] – – – [x] This server requires an encrypted connectionThat way, only authorized users
