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This page offer better information on auth: http://qmail.jms1.net/test-auth.shtml Manhgd (talk) 13:24, 17 September 2010 (UTC)[reply]

The HELO greeting in standard SMTP.

The standard SMTP has been updated and EHLO is now the recommended greeting, in all cases. Here is an extract from https://tools.ietf.org/html/rfc5321 :

Contemporary SMTP implementations MUST support the basic extension mechanisms.  For instance, servers MUST support the EHLO command even if they do not implement any specific extensions and clients SHOULD preferentially utilize EHLO rather than HELO. (However, for compatibility with older conforming implementations, SMTP clients and servers MUST support the original HELO mechanisms as a fallback.)