Email protocols define how email is sent and received between your devices and the mail server.
At ProRedLine, only modern and secure protocols are supported.

Supported Protocols at ProRedLine #

ProRedLine supports the following email protocols:

IMAP (Supported) #

IMAP is used for receiving and synchronizing email.

IMAP:

• Keeps emails synchronized across all devices
• Stores emails on the server
• Reflects changes instantly on all clients
• Is recommended for all users

IMAP is the default and recommended protocol.

SMTP (Supported) #

SMTP is used for sending email.

SMTP:

• Requires authentication
• Uses encrypted connections
• Is mandatory for outgoing email
• Works with all supported email clients

SMTP must always be configured with authentication enabled.

Unsupported Protocols #

POP3 (Not Supported) #

POP3 is not supported at ProRedLine.

POP3:

• Downloads emails to a single device
• Removes emails from the server
• Causes synchronization issues
• Increases risk of data loss
• Is considered outdated

To ensure reliability and consistency, POP3 access is disabled.

Why POP3 Is Not Supported #

POP3 is not supported because it:

• Breaks multi-device synchronization
• Causes missing emails across devices
• Makes troubleshooting difficult
• Increases support complexity
• Does not align with modern email usage

IMAP provides a safer and more predictable experience.

Required Security Settings #

All supported protocols require:

• Encrypted connections (SSL/TLS)
• Authentication using full email address and password

Unencrypted or anonymous connections are not allowed.

Protocol Usage Summary #

• Receiving email: IMAP
• Sending email: SMTP
• Legacy access: Not supported

Any email client must support IMAP and SMTP.

Common Configuration Mistakes #

• Selecting POP3 during setup
• Disabling SMTP authentication
• Using insecure ports
• Using partial usernames

These mistakes will prevent email from working.

Responsibility Notice #

You are responsible for:

• Using supported protocols only
• Configuring email clients correctly
• Avoiding legacy protocol usage

ProRedLine does not enable POP3 on request.