{"id":714,"date":"2007-02-24T19:43:43","date_gmt":"2007-02-24T19:43:43","guid":{"rendered":"http:\/\/markwilson.me.uk\/blog\/2007\/02\/sender-verify-failed-with-incorrect.htm"},"modified":"2007-03-05T16:11:03","modified_gmt":"2007-03-05T16:11:03","slug":"sender-verify-failed-with-incorrect","status":"publish","type":"post","link":"https:\/\/www.markwilson.co.uk\/blog\/2007\/02\/sender-verify-failed-with-incorrect.htm","title":{"rendered":"Sender verify failed with incorrect reverse DNS record"},"content":{"rendered":"

What a week! Switching hosting providers, setting up a new content management system for this blog (more on that as soon as it’s ready) and all at the same time as suffering e-mail problems as, since the middle of the week, every e-mail that I’ve sent to a particular contact has bounced back with the following message:<\/p>\n

This is an automatically generated Delivery Status Notification.<\/em><\/p>\n

Delivery to the following recipients failed.<\/em><\/p>\n

someone@<\/em>somewhere.net<\/em><\/p>\n

Reporting-MTA: dns;<\/em>mymailserver.markwilson.co.uk<\/em><\/p>\n

Final-Recipient: rfc822;<\/em>someone@<\/em>somewhere.net
\nAction: failed
\nStatus: 5.5.0
\nDiagnostic-Code: smtp;550-Verification failed for <<\/em>myalias@markwilson.co.uk>
\n550-No Such User Here
\n550 Sender verify failed <\/em><\/p>\n

I have various anti-spam measures on my mail server, but this appeared to be a problem when sending mail to a particular external host – e-mail sent to the same contact via a different mail server was received with no problems.<\/p>\n

I set about researching the 550 Sender verify failed<\/em> message and found various suggestions as to what might cause such an error – the most useful of which was a message on a newsgroup post which suggested it may be caused by an incorrect reverse DNS (PTR) record<\/a> (thanks to Ben Winzenz<\/a> for replying to that group a couple of years ago).<\/p>\n

Even though much of my mail was being delivered successfully, that seemed like a perfectly reasonable explanation – the reverse lookup for my IP address would have returned a hostname in the format username<\/em>.myisp<\/em>.co.uk, rather than mymailserver<\/em>.markwilson.co.uk (as confirmed by a DNS report on my domain<\/a>, which also commented that “RFC1912<\/a> 2.1 says you should have a reverse DNS for all your mail servers. It is strongly urged that you have them, as many mailservers will not accept mail from mailservers with no reverse DNS entry”), so I set about getting the record updated by my ISP (it has to be done by the owner of the IP address block).<\/p>\n

Initially I asked my ISP to add my mail server’s DNS name as a second PTR record for my IP address but in practice I found that DNS responded in a round robin<\/a> pattern (rather than returning all the matching records) so I couldn’t rely on a consistent response and was still experiencing mail delivery failures. Finally, after reverting to a single PTR record for my IP address and waiting for DNS propagation<\/a> (again), I was able to successfully send e-mail to the contact with whom I’d previously experienced issues (phew!).<\/p>\n

As more and more hosts take action to prevent unsolicited commercial e-mail (UCE – also known as spam), this is likely to be a more common occurrence and it just underlines how important a correct DNS configuration is.<\/p>\n","protected":false},"excerpt":{"rendered":"

What a week! Switching hosting providers, setting up a new content management system for this blog (more on that as soon as it’s ready) and all at the same time as suffering e-mail problems as, since the middle of the week, every e-mail that I’ve sent to a particular contact has bounced back with the … Continue reading Sender verify failed with incorrect reverse DNS record<\/span><\/a><\/p>\n","protected":false},"author":2,"featured_media":0,"comment_status":"open","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_exactmetrics_skip_tracking":false,"_exactmetrics_sitenote_active":false,"_exactmetrics_sitenote_note":"","_exactmetrics_sitenote_category":0,"_jetpack_memberships_contains_paid_content":false,"footnotes":""},"categories":[],"tags":[7,10],"class_list":["post-714","post","type-post","status-publish","format-standard","hentry","tag-dns","tag-spam"],"yoast_head":"\nSender verify failed with incorrect reverse DNS record - markwilson.it<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/www.markwilson.co.uk\/blog\/2007\/02\/sender-verify-failed-with-incorrect.htm\" \/>\n<meta property=\"og:locale\" content=\"en_GB\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Sender verify failed with incorrect reverse DNS record - markwilson.it\" \/>\n<meta property=\"og:description\" content=\"What a week! 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It is now, subject to specific requirements; however there's a big difference between \"supported\" and \"works\" and it was always theoretically possible. My current customer has a test environment running on a number of Azure VMs. All was working well, until I\u2026","rel":"","context":"In "Technology"","block_context":{"text":"Technology","link":"https:\/\/www.markwilson.co.uk\/blog\/topic\/technology"},"img":{"alt_text":"","src":"","width":0,"height":0},"classes":[]},{"id":10,"url":"https:\/\/www.markwilson.co.uk\/blog\/2004\/08\/tackling-spam-in-exchange-with-regex.htm","url_meta":{"origin":714,"position":1},"title":"Tackling spam in Exchange with the RegEx SURBL","author":"Mark Wilson","date":"Monday 23 August 2004","format":false,"excerpt":"Last week, I read an interesting e-mail from the Windows and .NET magazine network Exchange and Outlook update, discussing Spam URL Realtime Block Lists (SURBLs), which examine message contents to block spam. This week's e-mail highlights a free Exchange Server SURBL - the RegEx filter. The basic idea behind the\u2026","rel":"","context":"In \"Microsoft Exchange\"","block_context":{"text":"Microsoft Exchange","link":"https:\/\/www.markwilson.co.uk\/blog\/tag\/exchange"},"img":{"alt_text":"","src":"","width":0,"height":0},"classes":[]},{"id":629,"url":"https:\/\/www.markwilson.co.uk\/blog\/2006\/08\/controlling-spam-using-microsoft.htm","url_meta":{"origin":714,"position":2},"title":"Controlling spam using the Microsoft Exchange intelligent message filter","author":"Mark Wilson","date":"Wednesday 2 August 2006","format":false,"excerpt":"It may just be a co-incidence, but since I switched my e-mail from my ISP's servers to my own server a few months back, I've been seeing a huge increase in the amount of unsolicited commercial e-mail (UCE) - commonly known as spam - in my mailbox. At the time\u2026","rel":"","context":"In \"Microsoft Exchange\"","block_context":{"text":"Microsoft Exchange","link":"https:\/\/www.markwilson.co.uk\/blog\/tag\/exchange"},"img":{"alt_text":"","src":"","width":0,"height":0},"classes":[]},{"id":901,"url":"https:\/\/www.markwilson.co.uk\/blog\/2007\/09\/working-around-aols-short-sighted-antispam-measures.htm","url_meta":{"origin":714,"position":3},"title":"Working around AOL’s short-sighted antispam measures","author":"Mark Wilson","date":"Thursday 13 September 2007","format":false,"excerpt":"For the last year or so, I've been running my own mail server. This provides me with a number of advantages: I have no storage limits (other than the physical limits of my hardware). I have complete control over the mail server configuration. I'm not at the mercy of my\u2026","rel":"","context":"In \"Microsoft Exchange\"","block_context":{"text":"Microsoft Exchange","link":"https:\/\/www.markwilson.co.uk\/blog\/tag\/exchange"},"img":{"alt_text":"","src":"","width":0,"height":0},"classes":[]},{"id":378,"url":"https:\/\/www.markwilson.co.uk\/blog\/2006\/10\/implementing-real-time-block-lists-for.htm","url_meta":{"origin":714,"position":4},"title":"Implementing real time block lists for spam control","author":"Mark Wilson","date":"Friday 6 October 2006","format":false,"excerpt":"A couple of months back, I wrote a post about controlling spam using the Microsoft Exchange Intelligent Message Filter. Whilst it has to be said that the IMF has been effective in reducing my spam volumes (with very low false positives - strangely enough my blog posts are the ones\u2026","rel":"","context":"In \"Microsoft Exchange\"","block_context":{"text":"Microsoft Exchange","link":"https:\/\/www.markwilson.co.uk\/blog\/tag\/exchange"},"img":{"alt_text":"","src":"","width":0,"height":0},"classes":[]},{"id":829,"url":"https:\/\/www.markwilson.co.uk\/blog\/2007\/07\/implementing-senderid-framework-records-for-my-e-mail-server.htm","url_meta":{"origin":714,"position":5},"title":"Implementing SenderID Framework records for my e-mail server","author":"Mark Wilson","date":"Friday 6 July 2007","format":false,"excerpt":"I recently read Craig Spiezle and Alexander Nikolayev's TechNet Magazine article about the SenderID Framework (SIDF) - one of the available schemes to validate mail servers in the fight to reduce unsolicited commercial e-mail (UCE), more commonly known as spam. SIDF is similar to the Sender Policy Framework (SPF) in\u2026","rel":"","context":"In \"DNS\"","block_context":{"text":"DNS","link":"https:\/\/www.markwilson.co.uk\/blog\/tag\/dns"},"img":{"alt_text":"","src":"","width":0,"height":0},"classes":[]}],"jetpack_sharing_enabled":true,"_links":{"self":[{"href":"https:\/\/www.markwilson.co.uk\/blog\/wp-json\/wp\/v2\/posts\/714","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.markwilson.co.uk\/blog\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.markwilson.co.uk\/blog\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.markwilson.co.uk\/blog\/wp-json\/wp\/v2\/users\/2"}],"replies":[{"embeddable":true,"href":"https:\/\/www.markwilson.co.uk\/blog\/wp-json\/wp\/v2\/comments?post=714"}],"version-history":[{"count":0,"href":"https:\/\/www.markwilson.co.uk\/blog\/wp-json\/wp\/v2\/posts\/714\/revisions"}],"wp:attachment":[{"href":"https:\/\/www.markwilson.co.uk\/blog\/wp-json\/wp\/v2\/media?parent=714"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.markwilson.co.uk\/blog\/wp-json\/wp\/v2\/categories?post=714"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.markwilson.co.uk\/blog\/wp-json\/wp\/v2\/tags?post=714"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}