465 is the port number of Outgoing (SMTP) Secure, SSL/TLS is security type.
587 is the port number of Outgoing (SMTP roaming server) Secure,SSL/TLS is security type.
25 is the port number of Outgoing (SMTP), no any security type
587 is the insecure port number of Outgoing (SMTP roaming server), no any security type.
Thease are the general setting of SMTP Ports in Bresan.net Email
See Also this post:- https://assistsuite.wordpress.com/2021/02/15/how-to-sign-in-to-a-bresnan-email-account/
METHOD 1
Open your Outlook email program on your computer and click on the File option located on the top left menu bar. In the File, you will need to select Info and Account Settings
Next, you will need to enter your details in the Auto Account Set-up screen and click
Then, you will see that Outlook is automatically configuring your account as an IMAP account with all the correct settings
After a successful configuration, you will need to click on the Finish and then on the Close
NOTE: In case you are unable to configure your Bresnan email account with automatic settings, you can configure it manually by following the instructions provided below:
Open Outlook on your computer and select the File option located on the upper-left menu bar. In the File menu, you will need to select the Info and Account Settings
Next, you will need to select Manual Setup or additional server types option and click on the Next
Then, you will need to select the POP or IMAP option and click on the Next
Next, you will need to enter all the required details in the relevant fields and click the More Settings
Then, you will need to go to the Outgoing Server tab and make sure that the checkbox next to My outgoing server (SMTP) requires authentication option and also next to Use same settings as my incoming mail server
After that, you will need to go to the Advanced tab and make sure that your settings are as follows:
IMAP port settings for BRESNAN.NET
Incoming Port: 143, Outgoing Port: 465
Secure – Port: 993and Security Type: SSL/TLS (Accept all certificates)
Insecure – Port: 143 and Security Type: None (Accept all certificates
Not ticked: This server requires an encrypted connection (SSL)
Use the following type of encrypted connection is None
Note: If you are using Secure SSL / TLS Settings, you will need to select the checkbox next to “This service requires a secure connection (SSL)” option in both Outgoing and Incoming mails.
General SMTP port settings for BRESNAN.NET
Outgoing (SMTP) Secure – Port: 465 for and Security Type: SSL/TLS (Accept all certificates)
Outgoing (SMTP roaming server) Secure – Port: 587 and Security Type: SSL/TLS (Accept all certificates)
Outgoing (SMTP) – Port: 25 and Security Type: None (Accept all certificates)
Outgoing (SMTP roaming server) Insecure – Port: 587 and Security Type: None (Accept all certificates)
After entering the required information as suggested above and click on the OK button to save these settings.
Finally, you will need to click on the Next button and then on the Finish
Regards, Bruce