I have a client that we switched over to our service last Thursday. The mail server is located at mail.domain.tld (according to the A record), but their MX records on their authoritative DNS server both point to us. Unfortunately, they are still receiving E-mail directed at their server instead of going through ours.
Is this a common long-term issue where some spamware will automatically try the mail.domain.tld address, or is it possible that this is being cached for this long?
It all depends on what the old TTLs were -- for example, I've seen people accidentally put in a very high TTL of weeks/months/years. If that happens, even if the problem is discovered quickly, any DNS server that cached any records will keep them for that high TTL.
If the records are cached for longer than that, it is not RFC-compliant, and is most likely spam that is being sent to the old IP.
-Scott
---
Declude JunkMail: The advanced anti-spam solution for IMail mailservers.
Declude Virus: Catches known viruses and is the leader in mailserver vulnerability detection.
Find out what you've been missing: Ask about our free 30-day evaluation.
--- [This E-mail was scanned for viruses by Declude Virus (http://www.declude.com)]
--- This E-mail came from the Declude.JunkMail mailing list. To unsubscribe, just send an E-mail to [EMAIL PROTECTED], and type "unsubscribe Declude.JunkMail". The archives can be found at http://www.mail-archive.com.
