Mail.ru is an internet service provider and email provider, headquartered in Moscow. They have strict published requirements for delivering mail, such as prohibiting the use of link shorteners. All senders should register their sending domains for Mail.ru's Postmaster Tools for direct insight into reputation and performance in the inbox.
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smtp;550 Message was not accepted -- invalid mailbox. Local mailbox firstname.lastname@example.org is unavailable: account is disabled
smtp;550 spam message rejected. Please visit http://help.mail.ru/notspam-support/id?c=7y4ytdHbuOGv3O50NYTwpz1F-TVIpnactxtFPeFQSDYMAAAAaKgAAOX_3hE~ or report details to email@example.com. Error code: ###. ID: #