Should operational emails be sent from a marketing subdomain or transactional subdomain?

Summary

The overwhelming consensus from experts, marketers, and documentation is that operational (transactional) emails should be separated from marketing emails to maintain good deliverability and protect sender reputation. Using distinct subdomains or dedicated IP addresses is a highly recommended practice for achieving this separation. This isolates the reputation of each email type, preventing deliverability issues with marketing emails (like spam complaints) from negatively affecting the delivery of critical transactional emails. While some suggest that the main domain might be acceptable for low-volume transactional emails, a dedicated setup is crucial for high volumes. It's also vital to implement a separate IP warming strategy for transactional IPs, ensure proper email authentication (SPF, DKIM, DMARC), and actively monitor for and avoid blocklists. Furthermore, the reputation isn't just tied to the domain; the reply-to domain, the specific email address, and the domain in the 'from' line all play a role in the sender's overall reputation.

Key findings

  • Separate Streams: Separating transactional and marketing emails is crucial for maintaining deliverability.
  • Isolate Reputation: Using distinct subdomains or dedicated IPs isolates the reputation of each email type, protecting critical transactional emails.
  • Volume Matters: For low-volume transactional emails, the main domain *might* be acceptable, but a dedicated setup is vital for high volumes.
  • Warming: Dedicated transactional IPs require a separate and carefully managed IP warming strategy.
  • Authentication: Proper email authentication (SPF, DKIM, DMARC) is essential for improving deliverability and avoiding spam folders.
  • Reputation is Multi-Faceted: The entire email address, including the subdomain and the reply-to, affect reputation.

Key considerations

  • Infrastructure Setup: Plan and implement a clear infrastructure for separating email streams, including distinct subdomains or dedicated IPs.
  • Volume Assessment: Assess the volume of transactional emails to determine the necessity of a dedicated setup.
  • Warming Plan: Develop a separate IP warming plan for any newly dedicated IPs.
  • Authentication Protocols: Implement SPF, DKIM, and DMARC for all email sending domains and subdomains.
  • Blocklist Monitoring: Regularly check IPs and domains against blocklists and take immediate action if listed.
  • Reply-to Management: Carefully manage and monitor the reputation of the reply-to address as it also impacts deliverability.
  • Engagement Evaluation: Before choosing to use a marketing subdomain, carefully evaluate its existing engagement and reputation, especially if you are already warming a domain.

What email marketers say
10Marketer opinions

The general consensus is that operational emails should be separated from marketing emails to maintain deliverability and protect sender reputation. Using separate subdomains or dedicated IPs for transactional emails is a recommended practice. This isolates the reputation of each email type, preventing deliverability issues with marketing emails from impacting transactional emails. Some suggest that for low-volume transactional emails, the main domain might be acceptable, but a dedicated setup is crucial for high volumes. It's also highlighted that a separate IP warming strategy is needed for transactional IPs and that consistent authentication (SPF, DKIM, DMARC) is vital.

Key opinions

  • Separate Streams: Separating transactional and marketing emails is vital for maintaining good deliverability.
  • Isolate Reputation: Using separate subdomains or IPs isolates the reputation of each email type.
  • Volume Matters: For low-volume transactional emails, the main domain might be acceptable; high volume requires a dedicated setup.
  • Warming: Dedicated transactional IPs require a separate IP warming strategy.
  • Authentication: Proper email authentication (SPF, DKIM, DMARC) is crucial for improving deliverability.

Key considerations

  • Volume Assessment: Assess the volume of transactional emails to determine if a dedicated setup is necessary.
  • Existing Warmup: If using a marketing subdomain, consider its existing warmup status and sender reputation.
  • Employee Handling: Configure a reply-to address for operational emails to ensure proper employee handling.
  • List Segmentation: Evaluate the email list for engagement status to manage deliverability effectively.
  • IP Warming Strategy: Implement a separate IP warming strategy for dedicated transactional IPs.
Marketer view

Email marketer from Mailjet shares that transactional email should be sent from a dedicated IP to ensure deliverability is prioritised. Sending both email types from one server could impact your sender reputation.

December 2021 - Mailjet
Marketer view

Email marketer from SendGrid shares that separating the types of emails you are sending is key to good deliverability. Having a seperate IP for each email type ensures that if marketing email is marked as spam the transactional emails are still delivered.

February 2024 - SendGrid
Marketer view

Email marketer from Litmus shares that a dedicated IP for transactional email requires a separate IP warming strategy, distinct from any you have for your marketing IP. Do not send marketing email from the transactional IP as that may impact the IP warming schedule. If you have no IP warming schedule your deliverability may be impacted.

July 2024 - Litmus
Marketer view

Email marketer from Reddit explains that for low-volume transactional emails, it might be okay to use the main domain. However, if you're sending a large volume of transactional emails, a dedicated subdomain is highly recommended to avoid impacting the deliverability of your marketing emails.

April 2023 - Reddit
Marketer view

Email marketer from Stack Overflow explains that best practice is to isolate the reputation of transactional from marketing emails, and explains that separating them into different subdomains is a way to isolate reputation if one domain has a deliverability issue, it will not affect the other.

May 2024 - Stack Overflow
Marketer view

Email marketer from Reddit responds by stating that using a separate subdomain for operational emails is a good practice because it isolates your domain reputation. If your marketing emails get a lot of spam complaints, it won't affect your transactional emails.

January 2023 - Reddit
Marketer view

Marketer from Email Geeks recommends pushing back on a decision until the list is provided so you can evaluate the email volume and engagement status on the marketing domain.

January 2024 - Email Geeks
Marketer view

Marketer from Email Geeks recommends sending the operational email from the marketing subdomain with a reply-to configured to an employee mailbox, as long as the volume doesn't shock ISPs. Especially if you've already been sending to active customers off the marketing subdomain with positive results during warmup.

June 2022 - Email Geeks
Marketer view

Email marketer from Email on Acid responds by explaining that to improve deliverability, they use seperate subdomains for marketing and transactional email. They also make sure that their transactional subdomain is only used for transactional emails and nothing else, because this maintains a consistent reputation.

April 2024 - Email on Acid
Marketer view

Email marketer from Quora explains that if your emails are landing in the spam folder, start with authentication using SPF, DKIM, and DMARC. Secondly, consider setting up a dedicated IP address for sending emails for optimal deliverability. Avoid sending marketing and transactional emails from the same domain.

January 2023 - Quora

What the experts say
3Expert opinions

The experts emphasize the importance of separating email streams based on type (transactional vs. marketing) to maintain distinct sender reputations. Using different subdomains and IPs helps isolate these reputations, preventing deliverability issues in one stream from impacting the other. Moreover, the reply-to domain, the specific email address, and the domain in the 'from' line all contribute to the sender's overall reputation.

Key opinions

  • Separate Streams: Transactional and marketing emails should be treated as separate streams.
  • Isolated Reputation: Different subdomains and IPs isolate the reputation of each email stream.
  • Reputation Factors: Reply-to domain, the specific email address, and the domain in the 'from' line contribute to the sender's overall reputation.

Key considerations

  • Infrastructure: Set up distinct subdomains and IPs for transactional and marketing emails.
  • Monitoring: Monitor the reputation of each email stream independently.
  • Reputation impact: Be aware that all parts of your email address may have some kind of reputational impact.
Expert view

Expert from Word to the Wise, Laura Atkins, shares that the reputation of transactional and marketing streams are separate. She responds that if the same IP and From address is used for both then it can be hard to have different email delivery results.

September 2021 - Word to the Wise
Expert view

Expert from Email Geeks explains that the reply-to domain and email address will have a reputation. The e.company.example will have a reputation and the whole email address in the from: line will have a reputation.

December 2023 - Email Geeks
Expert view

Expert from Spam Resource explains the importance of separating different email streams like transactional and marketing emails. They advise using distinct subdomains and sender IPs to prevent deliverability issues related to one stream from affecting the other.

January 2023 - Spam Resource

What the documentation says
5Technical articles

Email service documentation consistently recommends separating transactional and marketing emails by using distinct subdomains or dedicated IP addresses. This separation helps protect sender reputation and ensures that deliverability issues in one stream don't negatively impact the other. The documents highlight the importance of proper authentication and avoiding blocklists for improved deliverability.

Key findings

  • Separate Streams: Separating transactional and marketing email streams is crucial for maintaining deliverability.
  • Subdomains/IPs: Using separate subdomains or dedicated IP addresses is a recommended practice.
  • Protect Reputation: Separation helps protect overall sender reputation.
  • Authentication: Proper authentication is essential for improved deliverability.
  • Avoid Blocklists: Ensure IP addresses are not on any blocklists.

Key considerations

  • Infrastructure Setup: Set up separate subdomains or dedicated IPs for transactional and marketing emails.
  • Authentication Protocols: Implement SPF, DKIM, and DMARC for authentication.
  • Blocklist Monitoring: Regularly check IP addresses against blocklists.
  • Email type identification: Clearly distinguish between transactional and marketing emails.
Technical article

Documentation from Postmark explains that transactional emails, such as password resets or purchase receipts, should be sent from a separate subdomain or dedicated IP address than marketing emails to maintain a good sender reputation.

June 2023 - Postmark
Technical article

Documentation from Microsoft answers questions on how to maintain distinct IPs for each type of email delivery and how that provides benefits for sender reputation and deliverability.

April 2021 - Microsoft
Technical article

Documentation from Google explains that using a dedicated IP address for transactional emails can help improve deliverability. Ensure the IP address is not on any blocklists and is properly authenticated.

February 2024 - Google
Technical article

Documentation from Amazon SES explains that utilizing separate sender identities (domains or subdomains) for different types of emails can help protect your overall sending reputation. If one type of email encounters deliverability issues, it won't necessarily impact the deliverability of other email types.

October 2022 - Amazon SES
Technical article

Documentation from SparkPost explains that separating transactional and marketing email streams is crucial for maintaining deliverability. They recommend using separate subdomains or IP addresses for each type of email.

September 2021 - SparkPost