I'm stumped and am looking for ways to diagnose what is happening. I sent some emails to a client last week, from Outlook 2. I've now found that they were never received. Today's headlines and essential stories curated from across the top Irish papers. Weather, live sport scores, and what's new in entertainment, business, cars.
I've tried emailing others on their domain and it looks like none of them receive my emails, but others on other domains do. I've checked my . I had no delivery reports or anything similar, and they're in the . I've also tried CCing myself in my latest emails to these people - they definitely send. I've checked with the client in question, and they never received anything from me, not even in a spam folder. I can receive emails from them, but they receive nothing from me - not even my replies to their emails. The first email had two small (5. PDF attachments, but the same fate befell follow- up emails that had no attachments. No images or links in any emails. They were normal work- related emails to between one and three individuals who I've had email exchanges with in the past through the same email address and Outlook. They're also in same country as me. There were no delivery error replies or anything similar. The first such email was sent 8: 5. Friday, so over 5 days ago, and nothing has been received on my side or theirs. Their emails to me arrive fine - and in fact, my first emails to them which failed were replies to their own emails. I've also had emails to this domain received normally as recently as two weeks ago. I've tried a variety of test emails to this domain and nothing goes through: Innocent emails that simply say . I recieved a perfectly normal . Gmail occasionally marks them as spam, which I'm looking into, but other clients seem to have no problems. Apart from that, I can't see anything to go on. I'm sure there's not enough here to diagnose my problem so I'm asking not for a solution, but for diagnosis steps I can take, for example: Is there anything ? My domain is assigned to an SMTP server on a Centos VPS. Are there any types of blacklist or security intervention I should know about and check for that would cause an email to not even get as far as a spam folder? I've seen this question Emails not being received by some people, which is similar but with two differences: They're using a mass- mailing system, I'm using regular Outlook, one email at a time. The accepted answer blames greylisting - however, my first missing email was from last Friday (five days ago), and apparently greylisting delays emails for between 1. In case I missed something, here are the results: Blacklist check. Checking XX. XX. XX. XX against 9. 5 known blacklists.. Listed 0 times with 1 timeouts . I don't know why the IPrange RBL check failed, but I checked manually at http: //iprange. I'm not blacklisted there, either. SMTP check: So the connection time is a bit slow (I'm not sure why, will look into that), but I don't see why that would cause sent mails to sometimes disappear completely. MX checks. I've tried browsing log files on the (Centos/Linux) server: /var/log/maillog - these are all empty. I believe these are sendmail logs, and I don't currently use sendmail, so this makes sense./var/log/exim/reject. I have fail. 2ban and I'll get on to checking my firewall settings etc to see if I can stop them even trying, but I don't think this is related/var/log/exim/main. Here's an email to three people on the same domain that failed for all three people (I've edited some of the alphanumeric strings and replaced the IP addresses with TXT. LIKE. TH. IS): 2. IP address MY. PC'S. IP. ADR. 2. 01. 6- 0. U9. Vw- 0. 00. 4vq- EG < = me@my- domain. H=(My. PCName) . Before and after both is nothing but brute force debris and other emails. I don't know what the significance of cluster. IP addresses are both Message. Labs IP addresses. Googling messagelabs. Message. Labs subscribers, but for the important differences that a) unlike the author I don't even get a non- delivery receipt and b) if it was Message. Labs blocking my email, I don't see why they'd block it for one of their customers but not another.
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August 2017
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