Autodiscovery
RFC6186 allows supporting email clients to automatically discover SMTP / IMAP addresses of the mailserver. For that, the following records are required:
Record |
TTL |
Type |
Priority |
Weight |
Port |
Value |
|---|---|---|---|---|---|---|
_submission._tcp |
3600 |
SRV |
5 |
0 |
587 |
mail.example.com. |
_submissions._tcp |
3600 |
SRV |
5 |
0 |
465 |
mail.example.com. |
_imap._tcp |
3600 |
SRV |
5 |
0 |
143 |
mail.example.com. |
_imaps._tcp |
3600 |
SRV |
5 |
0 |
993 |
mail.example.com. |
Please note that only a few MUAs currently implement this. For vendor-specific discovery mechanisms automx can be used instead.