| 250 |
Requested mail action okay, completed |
| 250-PIPELINING |
Server supports command pipelining |
250-SIZE <value> |
Server specifies maximum message size |
| 250-ETRN |
Server supports the ETRN extension |
| 250-ENHANCEDSTATUSCODES |
Server uses enhanced status codes |
| 250-8BITMIME |
Server supports the 8BITMIME extension |
| 250-DSN |
Server supports delivery status notifications (DSN) |
| 250-STARTTLS |
Server supports TLS encryption |
250-AUTH <authentication_types> |
Server specifies supported authentication types |
| 250-DELIVERBY |
Server supports the DELIVERBY extension |
| 250-RSET |
Server supports the RSET command |
| 250-HELP |
Server provides help information |
| 250-BINARYMIME |
Server supports binary MIME (Multipurpose Internet Mail Extensions) |
| 250-CHUNKING |
Server supports chunking for message transmission |
| 250-EXPN |
Server supports the EXPN command |
| 250-VRFY |
Server supports the VRFY command |
250-X-EXPS <extension> |
Server supports an additional extension |
| 250 X-LINK2STATE |
Server provides link-related state information |
