On Tue, Oct 03, 2006 at 09:12:27AM -0400, Anthony DeRobertis <[EMAIL PROTECTED]> wrote a message of 22 lines which said:
> $ host -t MX example.com > example.com has no MX record > > So, the mail should bounce. Wrong. Read RFC 2821 : Only resolvable, fully-qualified, domain names (FQDNs) are permitted when domain names are used in SMTP. In other words, names that can be resolved to MX RRs or A RRs (as discussed in section 5) are permitted, as are CNAME RRs whose targets can be resolved, in turn, to MX or A RRs. ... The lookup first attempts to locate an MX record associated with the name. If a CNAME record is found instead, the resulting name is processed as if it were the initial name. If no MX records are found, but an A RR is found, the A RR is treated as if it was associated with an implicit MX RR, with a preference of 0, pointing to that host. > Well, some mailers then send to the A record so maybe... They MUST, if they are compliant with the SMTP standard. -- To UNSUBSCRIBE, email to [EMAIL PROTECTED] with a subject of "unsubscribe". Trouble? Contact [EMAIL PROTECTED]
