1.5 KiB
1.5 KiB
EHLO Response Codes
EHLO Response Codes are used by an SMTP server in response to an EHLO command issued by an SMTP client.
Please note that the presence and specific EHLO response codes will depend on the SMTP server software, its version, and its configuration. The above table includes some commonly encountered EHLO response codes, but it may not cover every possible code or extension.
| EHLO Response Code | Description |
|---|---|
| 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 |