Why is it harder to rebuild domain/IP reputation after switching from Mailchimp?

Email marketer from Litmus Blog responds that you should focus on authentication and list hygiene, ensuring the new platform's settings match the old and you're not mailing to unengaged users. A new platform shines a light on existing issues.

Email marketer from ActiveCampaign Blog responds that after switching ESPs, it's essential to monitor bounce rates, complaint rates, and engagement metrics closely. He shares that a sudden increase in bounces or complaints can negatively impact your reputation and trigger spam filters, so careful list management is crucial.

Email marketer from GlockApps Blog responds that inconsistent sending practices are a major reason. They suggest that differences in authentication setup (SPF, DKIM, DMARC) between Mailchimp and your new provider, if not configured properly, will hurt your reputation.

Email marketer from Neil Patel's Blog explains that switching email platforms can disrupt established sending patterns, leading ISPs to view the new activity with suspicion. He recommends warming up your IP address and domain gradually to re-establish trust.

Email marketer from HubSpot Blog explains that factors like sender reputation, authentication (SPF, DKIM, DMARC), engagement rates, and list hygiene affect email deliverability. He responds that switching ESPs can expose issues in any of these areas, leading to deliverability problems if not addressed proactively.

Email marketer from Campaign Monitor Blog answers that when you change ESPs, you lose the reputation Mailchimp built for you, thus you should take special precautions to help regain that repuation by warming up your IP address, authenticating your domain, and cleaning your email lists.

Marketer from Email Geeks agrees with Laura that Mailchimp doesn't shut down accounts for no reason. She suggests being cautious with "login via Google" accounts, as someone using that to access a product/app doesn't necessarily want to get emails, and that just because you *have* an address doesn't mean you have permission to send to it. Also asks for the soft bounce reasons.

Email marketer from StackOverflow answers that you need to follow an IP Warm-Up procedure that ensures that you are gradually increasing the amount of emails you send per day and monitoring this for bounces and any blacklist results. They suggest starting with a low volume of emails and slowly increasing daily.

Email marketer from Customer.io Blog responds that a significant part of deliverability involves reputation. When switching, you leave behind any positive history associated with Mailchimp's servers. Build a new reputation carefully with a clean list, proven authentication, and a structured, gradually increased send schedule.

Email marketer from EmailOctopus Blog shares that when you switch from Mailchimp, you're essentially starting with a 'cold' IP and domain reputation from the perspective of mailbox providers. The sudden change in sending behavior triggers spam filters, lowering deliverability. They advise focusing on list hygiene and consistent sending volume.

Email marketer from Reddit user explains that one key factor is the age and reputation of the sending domain. If the domain itself is new or has a poor sending history, migrating to a new ESP won't magically fix that. They recommend focusing on building a clean list and authenticating your domain properly.

Expert from Email Geeks responds that she doesn’t know how much Google counts resending to 4xy addresses as a knock on reputation- probably not too much as they’re telling you it’s ok to resend

Expert from Email Geeks suggests that sending from a domain with no MX record is a very bad signal. She also mentions that Google soft bounces are often rate limiting based on reputation, but can also be abandoned accounts. The full text of the bounce message is needed to identify the underlying reason for the bounce.

Expert from Word to the Wise responds that ensuring proper authentication (SPF, DKIM, DMARC) is critical. She shares that ISPs use these records to verify the legitimacy of the sender, and incorrect or missing authentication can significantly impact deliverability, especially after switching platforms where these settings may not be automatically transferred or correctly configured.

Expert from Email Geeks states that Google has been more aggressive about full mailboxes lately. Sending to those accounts may be hurting your reputation. Google also has 4xy and 5xy account full messages, and the 5xy absolutely does count against your reputation. Without the full message it's hard to give good advice.

Expert from Email Geeks explains that just because you have a valid address doesn't mean folks want to hear from you. Soft bounces from Gmail are often a rate limiting based on reputation, but can also be abandoned accounts that aren't active. The full text of the message is needed to identify what the underling reason for the bounce is.

Expert from Spam Resource explains that after migrating to a new ESP, it's crucial to slowly ramp up sending volume. This involves starting with low volumes and gradually increasing the number of emails sent daily, giving mailbox providers time to assess your sending behavior and build a positive reputation. He highlights the importance of monitoring deliverability metrics during this process.

Expert from Email Geeks says that the 452 bounce is the temporary one, not the permanent one. It's unclear if the boxes are really full.

Documentation from SparkPost shares that sender reputation is closely tied to IP addresses. When switching from Mailchimp's shared IP infrastructure to a dedicated IP or a different shared pool, you're essentially starting with a new reputation. They recommend following IP warming best practices to gradually establish trust.

Documentation from Mailjet explains that using a new IP address for sending emails requires a warm-up period. They highlight the importance of gradually increasing the sending volume, monitoring deliverability rates, and actively managing bounces and complaints to build a positive reputation with ISPs.

Documentation from SendGrid explains that IP warming is the process of gradually increasing the volume of email sent from a new IP address. This allows mailbox providers to learn that the IP is sending legitimate email. They detail specific warming schedules based on sending volume.

Documentation from Google Postmaster Tools shares that when troubleshooting deliverability issues, after migrating away from a big email sending platform you should ensure you are fully authenticated, send wanted content, and also that you are not sending to old email addresses.