Publishing ports for IMAP

Андрей Михалевский 3,451 Reputation points
2021-12-27T09:08:04.683+00:00

Hi. I have:

rl-edge.domain.com 10.10.10.1 - edge server
mail.domain.com - 10.10.10.2 mailbox server

Exchange 2019 one-premise.

I have port forwarding on my router.

25 port to rl-edge.domain.com and 443 port to mail.domain.com

I need to connect from the outside world via IMAP. What ports should I forward and where?
587 and 993 to rl-edge.domain.com ? Will it proxy to mail.domain.com ? Should I use 587 instead of 25 ? What is the difference ?

Do I have to configure anything else besides turning on services?

Exchange Online
Exchange Online
A Microsoft email and calendaring hosted service.
6,198 questions
0 comments No comments
{count} votes

Accepted answer
  1. Andy David - MVP 157.9K Reputation points MVP Volunteer Moderator
    2021-12-27T13:22:16.587+00:00

    Use 587 for SMTP, as that is the client submittal SMTP port used for authentication.
    Enable and start the IMAP services if they are not already.

    Follow this guide:
    https://learn.microsoft.com/en-us/exchange/clients/pop3-and-imap4/configure-imap4?view=exchserver-2019

    For the cert, it will use the existing 3rd party cert which are using for mail.domain.com

    0 comments No comments

0 additional answers

Sort by: Most helpful

Your answer

Answers can be marked as Accepted Answers by the question author, which helps users to know the answer solved the author's problem.