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What DNS records are needed for email sending subdomains and are A records or SSL certificates required?

Summary

When setting up email sending subdomains, understanding the necessary DNS records is crucial for ensuring successful email delivery. This includes determining whether A records are essential and if SSL certificates are required for these subdomains. The consensus among email deliverability professionals is that while A records can serve a supporting role for transparency or redirection, they are not strictly necessary for email sending itself. Similarly, SSL certificates (TLS) are generally not required for email sending subdomains, as email encryption (TLS) happens during the SMTP connection, independent of HTTP-based SSL for web content. Instead, the focus should be on robust email authentication records like SPF, DKIM, and DMARC.

What email marketers say

Email marketers often navigate the complexities of DNS records with a focus on practical implications for campaign performance. Their primary concern is ensuring emails reach the inbox without issues, which means prioritizing deliverability-critical records. While the technical specifics can be daunting, marketers generally rely on their ESP's guidance and aim to understand the 'why' behind each record type, especially concerning email authentication.

Marketer view

Marketer from Email Geeks asks about the correct DNS setup for email sender subdomains, including where they should point. They express a lack of familiarity with the technical details, relying on their IT department and their ESP (Mailchimp) for guidance on verification processes, particularly regarding A records for splitting or updating sender email addresses.

10 Dec 2019 - Email Geeks

Marketer view

Marketer from Email Geeks suggests that their IT department is claiming they need to order expensive wildcard certificates for the domains, costing 159 euros per domain yearly. They question whether these wildcard certificates are truly necessary for sending emails from subdomains, indicating skepticism about the proposed costs and requirements.

10 Dec 2019 - Email Geeks

What the experts say

Email deliverability experts consistently emphasize that authentication records (SPF, DKIM, DMARC) are paramount for email sending subdomains, far more so than A records or SSL certificates for the subdomains themselves. They focus on the practical mechanisms that influence inbox placement and sender reputation, often dispelling common misconceptions about what constitutes a necessary DNS configuration for email.

Expert view

Expert from Email Geeks confirms that A records are truly a side quest when setting up subdomains for email sending. They emphasize that other records, such as TXT records for SPF, MX records, TXT for DKIM, and TXT for DMARC, are far more critical for successful email delivery.

10 Dec 2019 - Email Geeks

Expert view

Expert from Email Geeks clearly states that you do not have to have an A record to send emails. However, they stress that it is absolutely essential to have proper SPF, MX, DKIM, and DMARC configurations in place for email authentication and deliverability.

10 Dec 2019 - Email Geeks

What the documentation says

Official documentation from DNS providers and email standards bodies clarifies the purpose and necessity of various DNS record types for email. These sources consistently confirm that email delivery primarily relies on MX records and authentication mechanisms like SPF, DKIM, and DMARC, rather than A records or SSL certificates associated with web presence. They provide the technical specifications that underpin email's functioning on the internet.

Technical article

Documentation from Cloudflare Docs provides comprehensive information about various DNS record types, including A, AAAA, CNAME, MX, and TXT records. It explains their roles in managing DNS on their platform, serving as a foundational reference for configuring domains and subdomains for different internet services, including email.

10 Apr 2023 - Cloudflare Docs

Technical article

Documentation from Squarespace Help Center guides users on how to set up email resource records, specifically detailing the process for adding MX, DKIM, DMARC, and SPF records to domains managed through their platform. This highlights the practical steps required for proper email authentication and routing.

15 Mar 2023 - Squarespace Help Center

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