Yes. Consistency between the sender’s domain and the reply-to domain increases an email’s credibility. A domain mismatch can make the message look fraudulent and may cause it to be moved to the spam folder.
How does this affect deliverability?
Email providers (e.g., Gmail, Outlook) prefer matching domains because it indicates the message is legitimate. If domains don’t match, there’s a greater chance the email won’t be delivered to the inbox.
What role do the SPF, DKIM, and DMARC authentication protocols play?
SPF and DKIM verify that the email was dispatched by an authorized party. DMARC then checks whether the sender and reply-to domains match, and determines how to handle emails that fail these checks.
What happens if the domains don’t match?
A domain mismatch can cause recipients and email providers to distrust messages and increase the risk of phishing attacks. It can also lead to lower deliverability and a higher chance of the email being marked as spam.
Are there cases where domains may differ?
Yes, you can use different subdomains (e.g., info@example.com and support@service.example.com), but it’s important to properly set up SPF, DKIM, and DMARC so emails are verified as legitimate.
Find details in the article Why the sender’s domain must match the reply domain.
Michal Krejčí
