Standard SMTP Conversation
Mailserver says: 220 mailserver.domain.com SMTP ... Greetings
Sender says: Helo sender.host.name
Mailserver says: 250 Nice to meet you
Sender says: Mail From:<sender@his.address>
Mailserver says: 250 Sender ok
Sender says: Rcpt To:<recipient@his.address>
Mailserver says: 250 Recipient ok
Sender says: Data
Mailserver says: 354 Enter mail, end with "." on a line by itself
Sender says: Blah, blah, blah...
Sender says: <enter>.<enter>
Mailserver says: 250 Message accepted for delivery
Sender says: Quit
Example with strict syntax:
Here is an example of a transaction between a client (C) and an SMTP server (S)
S: 220 smtp.commentcamarche.net SMTP Ready C: EHLO machine1.commentcamarche.net S: 250 smtp.commentcamarche.net C: MAIL FROM:<webmaster@kioskea.net> S: 250 OK C: RCPT TO:<meandus@meandus.net> S: 250 OK C: RCPT TO:<tittom@tittom.fr> S: 550 No such user here C: DATA S: 354 Start mail input; end with <CRLF>.<CRLF> C: Subject: Hello C: Hello Meandus, C: How are things? C: C: See you soon! C: <CRLF>.<CRLF> S: 250 OK C: QUIT R: 221 smtp.commentcamarche.net closing transmission
SMTP Commands to Issue Example
HELO python.directsales.com MAIL FROM:manager@computersupply.com RCPT TO:james@directsales.com Data BLAH BLAH BLAH . QUIT
POP3 Commands to Issue Example
user krissyj pass Xiu$78g list retr 1 dele 1 retr 2 dele 2 quit
strict RFC smtp server syntax
Disallowing illegal syntax in MAIL FROM or RCPT TO commands. This may cause problems with home-grown applications that send mail, and with ancient PC mail clients. For this reason, the requirement is disabled by default ("strict_rfc821_envelopes = no").
- Disallowing RFC 822 address syntax (example: "MAIL FROM: the dude <dude@example.com>").
- Disallowing addresses that are not enclosed with <> (example: "MAIL FROM: dude@example.com").
use this syntax:
MAIL FROM:<marysue@hughes.net> 250 2.1.0 Ok RCPT TO:<marysue@hughes.net> 554 5.7.1 <marysue@hughes.net>
With SMTP Authentication
- Base64 encoding is described in section 6.8 of RFC 2045.
- Users of the emacs editor can easily encode/decode base64 strings in the scratch buffer with the base64-encode-region and base64-decode-region commands.
- The openssl enc subcommand can also be used to encode and decode base64.
C: AUTH LOGIN S: 334 VXNlcm5hbWU6 C: d2VsZG9u S: 334 UGFzc3dvcmQ6 C: dzNsZDBu S: 235 2.0.0 OK Authenticated
So you need to convert your username and password to Base64 encoding.
Here is a complete sample transaction:
220 smtp.b.hostedemail.com HELO smtp.hughes.net 250 omf08.b.hostedemail.com AUTH LOGIN 334 VXNlcm5hbWU6 pxFuaWXlaAB4dQuyZBNub9V0 334 UGFzc3dvcmQ6 K83NqwU9MA=a 235 2.0.0 Authentication successful MAIL FROM:<jennys@hughes.net> 250 2.1.0 Ok RCPT TO:<jennys@hughes.net> 250 2.1.5 Ok Data 354 End data with <CR><LF>.<CR><LF> BLAH BLAH BLAH . 250 2.0.0 Ok: queued as 15668AD9ED QUIT 221 2.0.0 Bye