This guide explains which protocols and ports can be used with Infomaniak's messaging services (including the Service Mail service).

Recommended ports and parameters for client configuration

When prompted during a software/messaging client configuration (Outlook, Thunderbird, mobile, etc.), prioritize the following parameters:

Technical Note: Port 587 with STARTTLS is the IETF standard practice for secure email submission. Port 465 is a secure alternative using implicit encryption.

If you specify other indications or disable encryption, email errors may occur.

Other supported ports (unencrypted or backward compatibility)

• port 143 (Standard port for IMAP reception - unencrypted, use 993)
• port 110 (Standard port for POP3 reception - unencrypted, use 995)‍
• port 995 (Secure port for POP3s reception - secure POP3 option)
• port 25 (Standard port for server-to-server transfer - may support STARTTLS for submission, but 587 is the standard for clients).
• STARTTLS authentication is supported on unencrypted ports (143, 110, 25) to enable TLS encryption.
• SMTP authentication supported (LOGIN or PLAIN methods).

API Usage and Transfer Security

The Infomaniak API does not offer any email connection as IMAP and SMTP are the "APIs". Use a library (such as Python: email.examples and imaplib) that uses IMAP and SMTP.

To display emails from PHP:
imap_open("{mail.infomaniak.com:993/imap/ssl}", $email, $password);

The MTA-STS mechanism is not implemented or verified, as Infomaniak uses DANE (DNS-based Authentication of Named Entities) to ensure an encrypted connection between servers when the following conditions are met:

• The client sends an email to a domain that has configured DANE.
• The client receives an email from an SMTP server that uses DANE.
• In all other cases (in the absence of DANE), the encrypted connection remains opportunistic.