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Missing Emails. Where are they going and how do I fix it?!?

• 1% or 2% of all emails sent to me never arrive. What is going on and how do I fix it! (It has nothing to do with my spam filters or folder.) Help! I have my own domain name for my small business. It has been hosted at aplus.net for about ten years. About four months ago, a few of my customers and suppliers started complaining that they were sending me emails that I just never received. At the time I was using Thunderbird. At first I thought the problem was with Aplus. I called tech support and they swore the problem was Thunderbird. Keep in mind I was receiving about 98%, 99% of all email. But about once or twice a day, something important would never show up. I checked my filters, my spam files, my trash. These lost emails were no where to be found. (I'd learn about it from follow-up emails or angry phone calls.) Since I couldn't figure out any way to understand if the problem was Thunderbird or Aplus, I decided to switch to Zoho.com for email. I switched all of my MX Records in my control panel as per zoho's instructions (see below.) I am not that tech-savvy, but I figured this both moved me off Thunderbird and -- with my MX records pointing to zoho -- bypassed aplus in case the problem was them. For about the first two weeks of the move to zoho, no reports of missing emails, but now it is happening again. I've had two customers complain of emails they sent that never arrived in the last four days. Nothing in the spam folder, no filters, no explanation. The emails from my clients saying, "Hey, why haven't you responded to email #1" have arrived, so it doesn't seem to be anything related to the particular sender. Help! Do I need to switch hosts? Did switching to zoho and changing my mx records not bypass aplus on the chance the problem is them? What could the problem be? How do I fix this before I miss something critical that cripples my business?! ----- I followed these directions exactly... Zoho instructions: MX Records are resource records required to route mails across to the mail servers that receives emails for your domains. To successfully receive mails, the MX information has to be changed in the control panel of your domain. Priority Mail Server 10 mx.zohomail.com 20 mx2.zohomail.com Usually, the MX changes gets effected only after an hour or so.

• Answer:

  Troubleshooting advice: determine a concrete example of a message that was sent but not received - up to and including the exact time/date/subject of the sent message. Approach your own technical support (zoho?) first, and ask them to verify in the mail logs whether they see any delivery attempt for message x from sender y at time z in the logs. If they do, great, there should be your answer (either it was delivered successfully to you, or more likely, there's an SMTP error code rejection in the logs). Assuming your own support people can find neither, have your sender approach their support people to do the exact same thing ("Hi, I sent x message to y on z, but they never received it. they've verified that the incoming mail server has no record of delivery being attempted, can you please examine the outgoing mail server logs for any trace of this message / reason why it was not delivered? Thanks.") hope this helps.