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Some emails may be delayed by your server or may be rejected by the server. Analysis of this error on Plesk Linux servers; let’s do,<\/p>\nSome emails may be delayed by your server or may be rejected by the server. Analysis of this error on Plesk Linux servers; let’s do,<\/p>\n
First of all, from a service provider (Hotmail is preferable.) Let us a mail to the address in a domain located on our Plesk Linux server, then connect with ssh,<\/p>\n
tail -1000 \/usr\/local\/PSA\/var\/log\/maillog | grep abc@example.com<\/p><\/blockquote>\n
Let’s see the error returned with the command;<\/p>\n
milter-reject: DATA from mail-oln040092066039.outbound.protection.outlook.com[40.92.66.39]: 451 4.7.1 Service unavailable – try again later; from =<abc@example.com> to=<xyz@example.com> proto=ESMTP helo=<EUR01-VE1-obe.outbound.protection.outlook.com><\/p><\/blockquote>\n
We have seen the error; this error is caused by the crash of the Plesk milter service, let’s fix and disable it via postfix;<\/p>\n
grep milters \/etc\/postfix\/main.cf<\/p><\/blockquote>\n
Let’s see,<\/p>\n
smtpd_milters = ,, inet:127.0.0.1:12768 unix:\/var\/spool\/postfix\/ctmilter\/ctmilter.sock non_smtpd_milters = ,, inet:127.0.0.1:12768 unix:\/var\/spool\/postfix\/ctmilter\/ctmilter.sock<\/p><\/blockquote>\n
The configuration lines are available in main.cf, in two lines, we need to remove them,<\/p>\n
nano \/etc\/postfix\/main.cf<\/p><\/blockquote>\n
Open our postfix main configuration file and search with ctrl + w and search for and remove the smtpd_milters and non_smptd_milters lines.<\/p>\n
After that;<\/p>\n
postfix reload<\/p><\/blockquote>\n
Let’s re-install and test our configuration; you will see that it was improved.<\/p>\n","protected":false},"excerpt":{"rendered":"
Some emails may be delayed by your server or may be rejected by the server. Analysis of this error on Plesk Linux servers; let’s do, First of all, from a service provider (Hotmail is preferable.) Let us a mail to the address in a domain located on our Plesk Linux server, then connect with ssh, […]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[7],"tags":[48],"class_list":["post-64","post","type-post","status-publish","format-standard","hentry","category-web-hosting","tag-plesk"],"_links":{"self":[{"href":"https:\/\/websitesworthcalculator.com\/blog\/wp-json\/wp\/v2\/posts\/64","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/websitesworthcalculator.com\/blog\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/websitesworthcalculator.com\/blog\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/websitesworthcalculator.com\/blog\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/websitesworthcalculator.com\/blog\/wp-json\/wp\/v2\/comments?post=64"}],"version-history":[{"count":2,"href":"https:\/\/websitesworthcalculator.com\/blog\/wp-json\/wp\/v2\/posts\/64\/revisions"}],"predecessor-version":[{"id":67,"href":"https:\/\/websitesworthcalculator.com\/blog\/wp-json\/wp\/v2\/posts\/64\/revisions\/67"}],"wp:attachment":[{"href":"https:\/\/websitesworthcalculator.com\/blog\/wp-json\/wp\/v2\/media?parent=64"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/websitesworthcalculator.com\/blog\/wp-json\/wp\/v2\/categories?post=64"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/websitesworthcalculator.com\/blog\/wp-json\/wp\/v2\/tags?post=64"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}