Solved

Email bounce backs

Posted on 2014-11-14
2
183 Views
Last Modified: 2014-11-24
Hi all,

We recently migrated to Office 365. Using Mimecast as a failover. We hit problems with DNS when 123-Reg MX record dropped. Re-instated the MX record but still getting random bounce backs from clients. Deleted cached email addresses but still getting host not found. Suspect that it is a local DNS issue. WHat is the standard TTL on DNS records for MX records.

Thanks
0
Comment
Question by:ncomper
[X]
Welcome to Experts Exchange

Add your voice to the tech community where 5M+ people just like you are talking about what matters.

  • Help others & share knowledge
  • Earn cash & points
  • Learn & ask questions
2 Comments
 
LVL 14

Accepted Solution

by:
Andy M earned 500 total points
ID: 40442418
DNS records can typically take anything from 24-48 hours to update so if the MX record was lost you may need to wait upto 2 days for it to propagate to external sending systems.

This said I've seen some domain hosts set so the records have a TTL of 1 week!

If you go to network-tools.com, punch in your domain and look at the dns records you can see the expiry set on the SOA record which will give you an idea of the TTL.

Are the bouncebacks happening when you send an email to a third party or when they send to you? What does the bounceback say?

If the emails were working fine before the MX records went and nothing has changed since aside from the MX been reinstated it sounds like it's just dns records waiting to update.
0
 
LVL 5

Author Closing Comment

by:ncomper
ID: 40461647
Thanks for the feedback  it was a mixture of replication AND legacy MX records that should not have been left active. 3-4 days on it all settled down
0

Featured Post

Technology Partners: We Want Your Opinion!

We value your feedback.

Take our survey and automatically be enter to win anyone of the following:
Yeti Cooler, Amazon eGift Card, and Movie eGift Card!

Question has a verified solution.

If you are experiencing a similar issue, please ask a related question

This is my first article on Expert Exchange on the Manual Method of Exporting Office 365 Mailboxes to PST format by using the eDiscovery mechanism of Office. Hope you will enjoy the article.
Microsoft Office 365 is a subscriptions based service which includes services like Exchange Online and Skype for business Online. These services integrate with Microsoft's online version of Active Directory called Azure Active Directory.
This is Part 3 in a 3-part series on Experts Exchange to discuss error handling in VBA code written for Excel. Part 1 of this series discussed basic error handling code using VBA. http://www.experts-exchange.com/videos/1478/Excel-Error-Handlin…
Polish reports in Access so they look terrific. Take yourself to another level. Equations, Back Color, Alternate Back Color. Write easy VBA Code. Tighten space to use less pages. Launch report from a menu, considering criteria only when it is filled…

617 members asked questions and received personalized solutions in the past 7 days.

Join the community of 500,000 technology professionals and ask your questions.

Join & Ask a Question