Does the presence of a DKIM signature in messages affect their deliverability?

Question

Email

There is a lot of information about the fact that DKIM is a necessary thing, but does anyone have real statistics on the deliverability of email messages with and without a DKIM signature? How important is having a DKIM signature?

thank you for your responses

Answer 1

Yes, it does, and sometimes quite strongly, and even if the domain of the DKIM signature does not match the sender's domain, but not always positively. In general, emails with DKIM deliver significantly better than emails without DKIM. But the negative reputation of the domain that signs emails (for example, a bad mailer with a lot of spam) can negatively affect the deliverability of emails signed by them.

Answer 2

Statistics depend on a bunch of factors. You can send different emails from the same domain and get different results. And vice versa, the same letter from different servers or domains can also be issued in completely different ways.
The situation is changing quite quickly, however, at the moment it is such a
mail ru, Yandex, gmail letters without DKIM with a properly configured SPF are accepted without any problems. Its absence can be critical if there are some other shortcomings in the email, domain settings, domain reputation, or other parameters that affect deliverability.
On many Western mailers the situation is about the same.
The main problem with DKIM is private company mail servers, which can be configured in any way you like. A month ago I helped set up DKIM for an organization that could not correspond with its customer - a large oil company like Tatneft, but I could be wrong. Those letters without DKIM are simply kicked off by mail servers. It is difficult to estimate the number of such servers, but their number will inevitably grow with a massive fight against spam and spoofing.

Answer 3

There was a very popular resource ukr.net in Ukraine in the past, and there everyone registered mailboxes (as popular as mail.ru in Russia), and for about a year the rule has been in effect if SPF, DKIM or DMARC contain incorrect information, then the letter is not even in spam if it hits, it will be eliminated at the server level and the recipient will not know what was sent to him, something was sent.

Answer 4

affects readability (as in the joke about the telegram that did not reach Stirlitz): the letter will be accepted and almost always put either in spam or silent spam, so in 2020+ it must