How to Change SMTP Port on Apple Mail (MacOS)

Mac Mail is different as compared to Outlook and Thunderbird, and so are the settings. Most of the issues i’ve come across where sending stops working, is due to port and ssl settings. In a MAC, this setting can be easily adjusted from the Preferences. If you are using multiple accounts, make sure you don’t change the ports for the ones that are already working. When you EDIT the SMTP, or Create NEW (you will see the field) called In Use By which can help in identifying the e-mail account it is associated with. BUT if you only have one account, then just go ahead and do it.

Changing the SMTP Port on a Mac OS

Open the Mac Mail (by clicking on  the mail icon from the dock). Once in the Mail, click Mail from the top bar

then select Preferences, and then Accounts. You will see the window like the one in the picture below.


Locate the Outgoing Mail Server (SMTP): tab and click on the up/down arrows. Then, select “Edit SMTP Server List

edit smtp server list

This will open a new dialog, with two tabs (Advanced & Account Information). You can setup a custom port or set it to automatically detect settings, or check which port is being used.  From the list of smtp servers, choose the server first before editing if you have more then 1 (probably) due to different e-mail accounts.

yosemite smtp server list

In the image above, i am using a custom port without letting the mail client automatically detect settings; this is because the provider has given me the settings; but if you do not know which port to use, then you can use the “Automatically detect and maintain account settings” option.

Kevin Arrows
Kevin is a dynamic and self-motivated information technology professional, with a Thorough knowledge of all facets pertaining to network infrastructure design, implementation and administration. Superior record of delivering simultaneous large-scale mission critical projects on time and under budget.

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How to Change SMTP Port on Apple Mail (MacOS)

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