How to warm a new domain on an already warmed IP address?

Summary

When warming a new domain on an already warmed IP address, experts and documentation emphasize the importance of gradually building domain reputation. While the warmed IP provides a head start, a domain warm-up is still essential, though less intense than starting from scratch. Key steps include starting with small email volumes to highly engaged subscribers, gradually increasing the volume while closely monitoring engagement metrics (open rates, click-through rates, spam complaints, bounce rates), maintaining consistent sending habits, using proper email authentication (SPF, DKIM, DMARC), and communicating domain changes to subscribers. Coordination with ESPs and focusing on valuable content also contribute to success.

Key findings

  • Domain Reputation is Key: Even with a warmed IP, domain reputation significantly affects deliverability with major ISPs like Gmail.
  • Gradual Ramp-Up is Crucial: A slow and steady increase in email volume builds trust and avoids triggering spam filters.
  • Engagement Matters Most: Starting with engaged subscribers and prioritizing valuable content results in positive engagement signals.
  • Monitoring is Essential: Closely tracking metrics such as open rates, click-through rates, spam complaints, and bounces helps identify and address deliverability issues.
  • Authentication Builds Trust: Proper email authentication (SPF, DKIM, DMARC) verifies sender identity and minimizes spam flagging.

Key considerations

  • Engagement Dip Signals: If engagement metrics decline, pause the warm-up and resolve the underlying issues before continuing.
  • Consistency is Vital: Maintain a regular sending schedule, even at low volumes, to establish trust with email providers.
  • Communicate Changes: Notify subscribers about the domain change to prevent confusion and reduce spam complaints.
  • Segment Subscribers: Segment your audience and focus initial warm-up efforts on your most engaged subscribers.
  • Coordinate with ESPs: Collaborate with your email service provider for guidance on best practices and technical configurations (e.g., multi-bounce domain).

What email marketers say
13Marketer opinions

Warming a new domain on an already warmed IP address involves gradually building domain reputation while leveraging the IP's existing trust. Experts recommend starting with small email volumes to highly engaged subscribers and slowly increasing the volume, closely monitoring engagement metrics such as open rates, click-through rates, and spam complaints. Maintaining consistency in sending valuable content, authenticating emails, and avoiding spam triggers are crucial. While the IP's warm status allows for a potentially faster ramp-up, caution and continuous monitoring are essential for sustained deliverability.

Key opinions

  • Domain Reputation: Domain reputation is crucial for deliverability, especially with major ISPs like Gmail.
  • Gradual Ramp-Up: Gradually increasing email volume is essential to build domain reputation and avoid triggering spam filters.
  • Engaged Subscribers: Starting with highly engaged subscribers helps signal positive engagement to mailbox providers.
  • Metric Monitoring: Monitoring open rates, click-through rates, spam complaints, and bounce rates is vital for assessing deliverability and making adjustments.
  • Authentication: Proper email authentication (SPF, DKIM, DMARC) builds trust with email providers and reduces spam flagging.

Key considerations

  • Engagement Dip: If engagement metrics dip during the warm-up, pause the process and address the issues before continuing.
  • Content Value: Consistently sending valuable content helps maintain a good domain reputation.
  • Spam Triggers: Avoiding spam triggers ensures emails are not flagged as spam.
  • Consistency: Maintain a consistent sending schedule to establish trust with email providers.
  • IP Warmth Advantage: Leverage the already warmed IP to expedite the domain warm-up process, but still proceed with caution.
Marketer view

Email marketer from SMTP2GO shares that domain reputation is crucial as it affects deliverability. They recommends consistently sending valuable content, authenticating your email, and avoiding spam triggers to maintain a good domain reputation.

March 2022 - SMTP2GO
Marketer view

Email marketer from GlockApps explains that warming IPs and domains together requires special care. The first mail should be to engaged users and then gradually increase.

October 2021 - GlockApps
Marketer view

Email marketer from Mailjet explains that domain reputation is crucial for deliverability, especially with ISPs like Gmail. Suggests starting with low volumes of emails to engaged users and gradually increasing the volume while monitoring deliverability metrics to warm up the domain effectively.

October 2024 - Mailjet
Marketer view

Email marketer from Email Geeks suggests that if the IP is sufficiently warmed and a good email sending cadence has been maintained to keep the IP in good standing then you should be good without much worry, but still take caution, and suggests ramping up slowly on new domains just to be safe. Suggests starting at 25 emails on Day 1 and doubling each day after is perfectly fine. Just watch your metrics - bounces should stay below 2% although you can get by with higher. Spam complaints ideally should stay at or below 0.1%. If you unsubscribe rate begins to skyrocket then maybe they are unaware of the transition you’ve made so make sure to be clear on that fact.

July 2021 - Email Geeks
Marketer view

Email marketer from Quora says that consistency is key for email sending. Sending emails regularly from your domain helps to establish trust with email providers. Make sure to maintain a consistent sending schedule, even when starting with low volumes.

March 2023 - Quora
Marketer view

Email marketer from Email Geeks shares that a domain warm up is definitely needed when changing a domain on a warm IP, but it doesn’t generally need to be quite as painstaking as a full IP warm up. Recommends a gradual migration of the sending domain, starting very small (200 messages or so) and then increasing by 100% each day (or each time you mail) for a week, getting to about 12,000 a day. After that you could increase by 200% each time until everything is migrated over. During the migration, make sure the engagement stats are the same between the two domains - if opens and clicks on the new domain lag significantly behind then pause the ramp-up at the level you’ve got to, and wait until the engagement catches up before moving ahead again.

January 2023 - Email Geeks
Marketer view

Email marketer from the Email Marketing Forum shares to warm your domain by ensuring proper email authentication (SPF, DKIM, DMARC) as this builds trust with email providers. It validates that you are who you say you are and reduces the chances of being flagged as spam.

June 2023 - Email Marketing Forum
Marketer view

Email marketer from Reddit shares to start with a small number of emails to your most active subscribers. Then, slowly increase the volume each day or week, while monitoring metrics such as open rates, click-through rates, and spam complaints. Engaging content to opted-in subscribers only.

July 2021 - Reddit
Marketer view

Email marketer from SendGrid explains that building a sender reputation involves establishing trust with ISPs. Recommends a gradual ramp-up of email volume, sending to engaged subscribers, and monitoring bounce rates, spam complaints, and unsubscribe rates to ensure a healthy sender reputation.

March 2021 - SendGrid
Marketer view

Email marketer from Email Geeks seconds the need to definitely warm the domain, stating that many providers put a lot of faith in domain reputation now.

December 2022 - Email Geeks
Marketer view

Email marketer from DigitalMarketer explains to isolate a segment of highly engaged subscribers and focus your initial sending on them. These users are more likely to open and click your emails, which sends positive signals to mailbox providers. Track metrics such as open rates, click-through rates, and unsubscribe rates during the warm-up period. If you notice any dips in engagement, pause the warm-up and address the issues before continuing.

November 2023 - DigitalMarketer
Marketer view

Email marketer from EmailOversight shares that to warm up an IP and domain together, you must be consistent with the type of mail you send, and who you send to. Make sure to stay consistent to get the best results.

March 2023 - EmailOversight
Marketer view

Email marketer from Email Geeks suggests starting at 500 emails then doubling from there as long as the IP was previously warmed. Suggests using a segment of the most engaged audience to do a proper warm up if you’re able to identify them.

October 2021 - Email Geeks

What the experts say
4Expert opinions

When warming a new domain on an already warmed IP address, domain reputation remains essential despite the IP's existing reputation. Experts emphasize starting with highly engaged users, gradually increasing volume, and closely monitoring engagement metrics. Open communication with customers about the domain change is also crucial to minimize confusion and spam complaints. Coordinating with email service providers and ensuring proper technical configurations, such as enabling multi-bounce domain and matching SPF records, can further enhance deliverability.

Key opinions

  • Domain Reputation Still Matters: Even with a warmed IP, domain reputation significantly impacts deliverability.
  • Engaged Users First: Prioritize sending to highly engaged users to establish a positive reputation.
  • Gradual Volume Increase: Increase sending volume gradually while monitoring engagement metrics.
  • Customer Communication: Informing customers about the domain change reduces confusion and spam complaints.

Key considerations

  • Multi-Bounce Domain: Enable multi-bounce domain to ensure proper return-path configuration.
  • SPF Alignment: Ensure SPF records match the 'from' domain to enhance authentication.
  • ISP Coordination: Coordinate with your email service provider to optimize deliverability during the transition.
  • Monitor Engagement: Continuously monitor engagement metrics (opens, clicks, spam complaints) to adjust your strategy.
Expert view

Expert from Email Geeks shares that the more/better you can warn customers about a domain change, the less confusion will happen, and the fewer spam complaints you’ll get, and deliverability will be less likely to suffer.

January 2022 - Email Geeks
Expert view

Expert from Word to the Wise (Laura Atkins) explains that domain reputation is essential when warming an IP address. Domain reputation matters; if you're only changing the domain, the IP's existing reputation provides a boost, allowing for a faster ramp-up. Start by sending to engaged users to ensure positive engagement and then gradually increase the volume while watching for negative signals. If your engagement is good, you can increase volume more aggressively.

August 2022 - Word to the Wise
Expert view

Expert from Email Geeks confirms that domain warming is indeed a thing now. Suggests coordinating with the SFMC deliverability team to have both domains active for a period of time, and potentially even ensure that multi-bounce domain is enabled, so that you can have the return-path (SPF) domain match the from domain in both cases.

June 2024 - Email Geeks
Expert view

Expert from Spam Resource (Steve Linford) explains that when moving to a new domain on an existing IP address, warming is still necessary, but less intense than a completely new setup. Start by sending to your most engaged users, monitor engagement, and gradually increase volume. Don't immediately blast your entire list. Prioritize users who frequently open and click your emails, as these interactions signal positive engagement to ISPs.

December 2024 - Spam Resource

What the documentation says
4Technical articles

Warming a new domain on a warmed IP involves gradually building a sending reputation by increasing email volume over time, starting with recipients who frequently engage with your messages. Monitoring delivery rates, bounce rates, and complaint rates is crucial to identify and address deliverability issues. Focus on engaged users and positive engagement signals to avoid triggering spam filters and establish a legitimate sender reputation.

Key findings

  • Consistent Volume: Maintaining a consistent sending volume helps establish a positive sending reputation.
  • Gradual Increase: Gradually increasing sending volume is essential for establishing a reputation with email filters.
  • Engaged Recipients: Sending to engaged recipients first is crucial for building a solid reputation.
  • Positive Signals: Scaling up based on positive engagement signals prevents triggering spam filters.

Key considerations

  • Delivery Rates: Monitor delivery rates to identify and address deliverability issues.
  • Bounce Rates: Monitor bounce rates to ensure they stay low.
  • Complaint Rates: Monitor complaint rates to maintain a positive sending reputation.
  • Feedback Loops: Pay attention to feedback loops to identify and address any problems.
Technical article

Documentation from Google explains that using a consistent sending volume helps establish a positive sending reputation. Recommends gradually increasing sending volume and monitoring delivery rates in Postmaster Tools to identify and address any deliverability issues.

January 2023 - Google Workspace Admin Help
Technical article

Documentation from Microsoft recommends that new domains or IPs should gradually increase their sending volume to establish a positive reputation with Microsoft's email filters. This includes sending to engaged recipients and monitoring feedback loops.

March 2021 - Microsoft
Technical article

Documentation from Amazon SES explains if you're starting out with a new sending domain, you should establish a reputation as a legitimate sender by gradually increasing the volume of email you send. Start by sending email to recipients who frequently engage with your messages. As you gradually increase your volume, monitor your bounce and complaint rates to make sure that they stay low.

February 2025 - Amazon SES
Technical article

Documentation from SparkPost explains that when warming a new domain, it is essential to gradually increase sending volume. Focus on sending to engaged users first and then scale up based on positive engagement signals. This prevents triggering spam filters and builds a solid sender reputation.

February 2024 - SparkPost