49 lines
1.7 KiB
Plaintext
49 lines
1.7 KiB
Plaintext
General Notes
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--------------
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* MX is NOT required, but an A record, or CNAME to a MX MUST be present at the least.
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* EHLO should be tried, then fall back to HELO
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* The 250 return code from RCPT TO is not actually clear-cut. A 251 may be
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returned if the message was forwarded to another address. This could be a
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useful indicator to end-users that an address should be updated.
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* RCPT TO can accpet just "postmaster" without a domain name
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* Server MUST not close connection before:
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- QUIT and returning 221 response
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- Forced requirement, and only after returning a 421 response
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- Clients expriencing a forced connection closure, without prior warning should
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just treat it like a 451 closure regardless
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* ALWAYS use blocking sockets for the initial connection (this should prevent
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Exim4's whining about sync).
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Response codes
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--------------
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* From RFC2821, 4.2.
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- In particular, the 220, 221, 251, 421, and 551 reply codes
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are associated with message text that must be parsed and interpreted
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by machines.
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Error Codes
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------------
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* Numeric 5yz = Error
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- 550/RCPT TO = Relay denied
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- 500 = Unknown command
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* Numeric 2yz = Normal
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* Numeric 4yz = Temporary failure??
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<?php
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class EsmtpTransport implements Transport, EsmtpCommandWriter {
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}
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interface EsmtpCommandWriter {
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public function getBuffer();
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public function executeCommand($command, $expectedCodes);
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}
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interface Extension {
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public function getKeyword();
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public function afterEhlo($commandWriter);
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public function getRcptParams();
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public function getMailParams();
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public function atCommand($commandWriter, $command, $expectedResponse) throws CommandSentException;
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}
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