--- title: DMARC Check description: The DMARC policy is used by email services to combat spam and malicious activity. DMARC verifies the actual and specified sender address. If these two addresses do not match, the letter is rejected. E --- [Skip to content](https://help.ishosting.com/en/dmarc-check#main-content) - [English](https://help.ishosting.com/en/dmarc-check) - [Русский](https://help.ishosting.com/ru/dmarc-check) English Show submenu for translations [![is\*hosting](https://help.ishosting.com/hubfs/Logo_Ishosting_mono-1.svg)](https://help.ishosting.com/en) - [Blog](https://blog.ishosting.com/en) - [Support](https://my.ishosting.com/en/tickets) Open main navigation Close main navigation - [Blog](https://blog.ishosting.com/en) - [Support](https://my.ishosting.com/en/tickets) - - [English](https://help.ishosting.com/en/dmarc-check) - [Русский](https://help.ishosting.com/ru/dmarc-check) English Show submenu for translations - [Go to ishosting.com](https://ishosting.com/) [Go to ishosting.com](https://ishosting.com/) Hello. How can we help you? - There are no suggestions because the search field is empty. 1. [Help Center](https://help.ishosting.com/en) 2. [Mail](https://help.ishosting.com/en/mail) 3. [Getting Started](https://help.ishosting.com/en/mail#getting-started) # DMARC Check The DMARC policy is used by email services to combat spam and malicious activity. DMARC verifies the actual and specified sender address. If these two addresses do not match, the letter is rejected. Even if the sender mistakenly entered his address incorrectly. The following error message is saved in the mail logs: ``` Sept 23 14:23:42 vh12 splogger[28569]: 1d0RET-0007Qn-0Y <= specified_sender_box@mail.ru U=***** P=local S=901Sept 23 14:23:42 vh12 splogger[28571]: 1d0RET-0007Qn-0Y ** recipient_box@mail.ru R=dnslookup T=remote_smtp: SMTP error from remote mail server after end of data: host mxs.mail.ru [94.100.180.150]: 550 5.7.1 This message was not accepted due to domain (mail.ru) owner DMARC policy (RFC 7489) https://help.mail.ru/mail-help/postmaster/dmarc ``` [How does an SMTP server work?](https://blog.ishosting.com/en/what-is-smtp) ### If messages fail DMARC When sending mail using scripts, the From and Envelope From address may be replaced by mistake. Such a letter is rejected by the server. To pass checks and improve email deliverability, follow these guidelines: - Do not change the sender's address in the settings, if possible. By default, your\_login@server\_name is entered as the sender. - Send mail using SMTP protocol. If you still have questions, please create a [ticket to technical support](https://ishosting.com/en/support). - [Virtual Private Servers](https://help.ishosting.com/en/virtual-private-servers#main-content) - [Getting Started](https://help.ishosting.com/en/virtual-private-servers#getting-started) - [Working with VPS](https://help.ishosting.com/en/virtual-private-servers#working-with-vps) - [Software](https://help.ishosting.com/en/virtual-private-servers#software) - [Backup and Data Storage](https://help.ishosting.com/en/virtual-private-servers#backup-and-data-storage) - [Additional Services](https://help.ishosting.com/en/virtual-private-servers#additional-services) - [VPS Load](https://help.ishosting.com/en/virtual-private-servers#vps-load) - [Other Issues](https://help.ishosting.com/en/virtual-private-servers#other-issues) - [Dedicated Servers](https://help.ishosting.com/en/dedicated-servers#main-content) - [Getting Started](https://help.ishosting.com/en/dedicated-servers#getting-started) - [Working with Dedicated Server](https://help.ishosting.com/en/dedicated-servers#working-with-dedicated-server) - [Additional Services](https://help.ishosting.com/en/dedicated-servers#additional-services) - [Other Issues](https://help.ishosting.com/en/dedicated-servers#other-issues) - [Server Administration](https://help.ishosting.com/en/server-administration#main-content) - [API](https://help.ishosting.com/en/server-administration#api) - [Windows Instructions](https://help.ishosting.com/en/server-administration#windows-instructions) - [UNIX Instructions](https://help.ishosting.com/en/server-administration#unix-instructions) - [ispmanager](https://help.ishosting.com/en/server-administration#ispmanager) - [VestaCP](https://help.ishosting.com/en/server-administration#vestacp) - [DirectAdmin](https://help.ishosting.com/en/server-administration#directadmin) - [BitrixVM](https://help.ishosting.com/en/server-administration#bitrixvm) - [Security](https://help.ishosting.com/en/server-administration#security) - [DDoS Protection](https://help.ishosting.com/en/server-administration#ddos-protection) - [Working with Files](https://help.ishosting.com/en/server-administration#working-with-files) - [Databases](https://help.ishosting.com/en/server-administration#databases) - [PHP](https://help.ishosting.com/en/server-administration#php) - [Logs and Statistics](https://help.ishosting.com/en/server-administration#logs-and-statistics) - [Diagnostics and Troubleshooting](https://help.ishosting.com/en/server-administration#diagnostics-and-troubleshooting) - [HestiaCP](https://help.ishosting.com/en/server-administration#hestiacp) - [cPanel](https://help.ishosting.com/en/server-administration#cpanel) - [aaPanel](https://help.ishosting.com/en/server-administration#aapanel) - [FastPanel](https://help.ishosting.com/en/server-administration#fastpanel) - [Other](https://help.ishosting.com/en/server-administration#other) - [Mail](https://help.ishosting.com/en/mail#main-content) - [Getting Started](https://help.ishosting.com/en/mail#getting-started) - [ispmanager](https://help.ishosting.com/en/mail#ispmanager) - [DirectAdmin](https://help.ishosting.com/en/mail#directadmin) - [VestaCP](https://help.ishosting.com/en/mail#vestacp) - [Other Issues](https://help.ishosting.com/en/mail#other-issues) - [VPN](https://help.ishosting.com/en/vpn#main-content) - [Getting Started](https://help.ishosting.com/en/vpn#getting-started) - [Android](https://help.ishosting.com/en/vpn#android) - [iOS](https://help.ishosting.com/en/vpn#ios) - [macOS](https://help.ishosting.com/en/vpn#macos) - [Mikrotik](https://help.ishosting.com/en/vpn#mikrotik) - [Linux](https://help.ishosting.com/en/vpn#linux) - [Windows](https://help.ishosting.com/en/vpn#windows) - [Amnezia VPN](https://help.ishosting.com/en/vpn#amnezia-vpn) - [Hysteria](https://help.ishosting.com/en/vpn#hysteria) - [Data Storage](https://help.ishosting.com/en/data-storage#main-content) - [Getting Started](https://help.ishosting.com/en/data-storage#getting-started) - [Backups](https://help.ishosting.com/en/data-storage#backups) - [Other](https://help.ishosting.com/en/data-storage#other) - [SSL Certificates](https://help.ishosting.com/en/ssl-certificates#main-content) - [Getting Started](https://help.ishosting.com/en/ssl-certificates#getting-started) - [Install](https://help.ishosting.com/en/ssl-certificates#install) - [Affiliate Program](https://help.ishosting.com/en/affiliate-program) - [Additional Services](https://help.ishosting.com/en/additional-services#main-content) - [Additional IP](https://help.ishosting.com/en/additional-services#additional-ip) - [Control Panels](https://help.ishosting.com/en/additional-services#control-panels) - [Antivirus](https://help.ishosting.com/en/additional-services#antivirus) - [Client Area](https://help.ishosting.com/en/client-area#main-content) - [Balance History](https://help.ishosting.com/en/client-area#balance-history) - [Payment for Services](https://help.ishosting.com/en/payment-for-services#main-content) - [Getting Started](https://help.ishosting.com/en/payment-for-services#getting-started) - [My Account](https://help.ishosting.com/en/payment-for-services#my-account) - [Payments](https://help.ishosting.com/en/payment-for-services#payments) - [Other Issues](https://help.ishosting.com/en/payment-for-services#other-issues) - [Documents and Policies](https://help.ishosting.com/en/documents-and-policies#main-content) - [General](https://help.ishosting.com/en/documents-and-policies#general) - [Company](https://help.ishosting.com/en/documents-and-policies#company) - [Questions and Answers](https://help.ishosting.com/en/questions-and-answers#main-content) - [Control Panels](https://help.ishosting.com/en/questions-and-answers#control-panels) - [ispmanager](https://help.ishosting.com/en/questions-and-answers#ispmanager) - [Windows](https://help.ishosting.com/en/questions-and-answers#windows) - [Linux](https://help.ishosting.com/en/questions-and-answers#linux) - [Mail](https://help.ishosting.com/en/questions-and-answers#mail) - [Other](https://help.ishosting.com/en/questions-and-answers#other) - [Special Offers](https://help.ishosting.com/en/special-offers) - [is\*smart](https://help.ishosting.com/en/issmart#main-content) - [General Info](https://help.ishosting.com/en/issmart#general-info) - [Getting Started](https://help.ishosting.com/en/issmart#getting-started) - [API](https://help.ishosting.com/en/issmart#api) - [AI Models](https://help.ishosting.com/en/issmart#ai-models) - [List of Apps](https://help.ishosting.com/en/list-of-apps) [![is\*hosting](https://help.ishosting.com/hubfs/ishosting-logo-black.svg "is*hosting")](https://ishosting.com) Copyright © 2025, © Webrain OÜ