twogee commented on issue #100: Send FQDN instead of simple hostname in SMTP HELO command URL: https://github.com/apache/ant/pull/100#issuecomment-527823892 Looking further, RFC-821 states "The argument field contains the host name of the sender-SMTP." and the formal syntax suggests that "domain" means FQDN. RFC-2821 clarifies ``` The argument field contains the fully-qualified domain name of the SMTP client if one is available. In situations in which the SMTP client system does not have a meaningful domain name (e.g., when its address is dynamically allocated and no reverse mapping record is available), the client SHOULD send an address literal (see section 4.1.3), optionally followed by information that will help to identify the client system. ``` RFC-5321 deprecates the use of address literals.
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