Custom Mail Server: Basic Authentication

We support both IMAP and POP3 for incoming mail. However, for most users and modern workflows, we strongly recommend using IMAP. POP3 is provided only for legacy systems, as it lacks folder synchronization, multi-device support, and server-side state tracking, which are essential for a seamless email experience across devices.

For an Outgoing mail connection to a custom mail server, select SMTP.

Basic Authenticated incoming and outgoing connections

Field	Value	Definition
Encryption	No Encryption SSL/TLS STARTTLS	The preferred encryption method.
Username	Text field	The username you are authenticating with.
Password	Text field	Password for the above mentioned username
Use a shared mailbox	Toggle on to enter a shared mailbox alias	Use it in case the mailbox you want to access is shared with the username you are connecting with, but not the same mailbox.
Host	Text field	The host name of your mail server.
Port	Number field	The port you want the connection to be established through. Leave blank or 0 to use the default port for the connection type. Defaults are: IMAP / IMAP with STARTTLS: 143 SSL/TLS IMAP: 993 POP3: 110 SSL/TLS POP3:995 SMTP: 25 SSL/TLS SMTP: 465SMTP with STARTTLS: 587