Extension support #9
Description
The following tables show which extensions are supported by which MTAs. smtpproxy might, or might not, want to support some of them.
| RFC | | Google | Postfix | Exim | Amazon | Facebook | mailcontrol.com | mailgun |
|------+---------------------+----------+----------+-----------+----------+----------+-----------------+-------------|
| 1870 | SIZE | 35882577 | 10240000 | 104857600 | 15728640 | | 1073741824 | 52428800 |
| 6152 | 8BITMIME | x | x | x | x | x | x | x |
| 3207 | STARTTLS | x | x | x | x | x | x | x |
| 3463 | ENHANCEDSTATUSCODES | x | x | | | x | x | x |
| 2920 | PIPELINING | x | x | | | x | x | |
| 3030 | CHUNKING | x | | | | | | |
| 6531 | SMTPUTF8 | x | | | | | | |
| | VRFY | | x | | | | | |
| | ETRN | | x | | | | x | |
| 3461 | DSN | | x | | | | x | |
| | HELP | | | x | | | x | |
| 1894 | DELIVERBY | | | | | | x | |