Should operational emails be sent from a marketing subdomain or transactional subdomain?
Summary
What email marketers say10Marketer opinions
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.
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.
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.
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.
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.
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.
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.
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.
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.
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.
What the experts say3Expert opinions
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.
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.
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.
What the documentation says5Technical articles
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.
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.
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.
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.
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.