Which ports must be open for a mail server that supports IMAP, …
May 26, 2025 · I intend to keep port 25 (SMTP) closed and only use port 587 (submission) for sending mail, and ports 993 and 995 for receiving mail via IMAP and POP3. So in total, I …
What are the standard port numbers for SMTP, POP3, IMAP4, RPC, …
Jun 27, 2016 · SMTP port 25 or 2525 or 587. Secure SMTP (SSL / TLS) – port 465 or 25 or587, 2526 POP3 Port 110, non-encrypted port- 995 IMAP protocol default ports: Port 143 and IMAP …
How do you properly test an imap:993 connection to determine …
Oct 15, 2020 · How do I properly test port 993 to determine if 1) I have explicit or implicit TLS? and 2) determine whether STARTTLS is enabled and working if it is set to explicit?
IMAPS, SSL or TLS - Server Fault
Jun 1, 2020 · This is the recommended method (see RFC 8314). IMAP over implicit TLS uses the standard port 993 and it is also known as IMAPS. IMAP over Explicit TLS uses the standard …
postfix - What ports to open for mail server? - Server Fault
Port 25 needs to be open in order for it to receive mail from the internet. All mail servers will establish a connection on port 25 and initiate TLS (encryption) on that port if necessary. …
Is port 587 preferred over port 465 in SMTP? - Server Fault
May 28, 2021 · Port 465 is an SSL-only variant of port 25, but this is already handled fine with opportunistic encryption negotiated through the STARTTLS response to the EHLO command, …
Is it safe to keep IMAP ports for public? - Server Fault
Sep 9, 2019 · Port 465 and 587 are used for users of your system sending emails out. You probably only need 1 of these to - 587 is the more commonly used port. Port 143 is …
networking - Can we use ports other than 993 for imap in …
Can we use ports other than 993 for IMAP in Microsoft hosted exchange servers? Are these ports fixed from the Microsoft side OR any organization can configure its own port? Please share …
How to assign certificate to IMAP/S and SMTP/S in Exchange 2016?
Jan 23, 2024 · I have Exchange 2016 and I want to assign one officially signed-off certificate to the IMAP/S port 993/tcp and SMTP/S port 465/tcp . I went through several configuration …
Exchange IMAP Setup SSL & TLS - Server Fault
Oct 3, 2017 · Port 993 is for direct SSL/TLS and the default IMAP port 143 uses opportunistic TLS i.e. STARTTLS command to establish secured connection within the plain text connection. …