Why is my dedicated IP on Hotmail's blocklist on day 1 of IP warming?

Email marketer from SendGrid responds that gradually increasing sending volume and frequency while maintaining consistent patterns helps build a positive reputation and avoid triggering spam filters.

Email marketer from GMass suggests that hitting spam traps can immediately blacklist an IP, so maintaining a clean list and following best practices for email acquisition is essential.

Email marketer from StackOverflow recommends checking the IP against known blocklists (e.g., Spamhaus, Barracuda) to identify potential reputation issues before starting the warm-up process.

Email marketer from EmailVendorSelection shares that proactive monitoring through feedback loops and engaging with mailbox providers can help identify and resolve deliverability issues early on.

Marketer from Email Geeks shares that the IP and Hotmail likely have a history prior to the user.

Email marketer from SuperOffice explains the importance of properly handling bounces and unsubscribes to maintain a clean email list and avoid being flagged as a spammer.

Email marketer from Litmus recommends A/B testing subject lines and email content to improve engagement and sender reputation, as higher engagement rates indicate legitimate email activity.

Email marketer from Reddit suggests that Hotmail/Outlook is known to be aggressive with new IPs, often requiring a careful and gradual warm-up process.

Email marketer from Reddit responds that the IP address may have had a poor sending reputation previously, leading to its immediate blacklisting.

Email marketer from Mailjet explains that proper setup of SPF, DKIM, and DMARC records is essential to authenticate your emails and improve deliverability, especially for new IPs.

Marketer from Email Geeks shares that Hotmail's daily rate-limiting assigns volume per IP per day, and starts really low and typically blocks new IPs at first, or used to.

Email marketer from Email Discussions advises to check the IP's reputation using tools like Sender Score and ensure that DNS records (SPF, DKIM, DMARC) are properly configured before starting the warm-up process.

Marketer from Email Geeks suggests Hotmail could have blocked the IP already, dislikes the network neighbourhood, or has an unknown reason.

Expert from Spam Resource responds explaining that a possible reason for being blocked immediately is not requesting pre-emptive accommodation from Microsoft, and provides details on how to do so.

Expert from Email Geeks responds that it is Hotmail being Hotmail and suggests reaching out and using a certain magic phrase to inform them that you’re trying to do IP warming, then directs them to <https://www.spamresource.com/2021/05/requesting-pre-emptive-accommodation.html>.

Expert from Email Geeks then corrects the link to the correct form: <http://go.microsoft.com/fwlink/?LinkID=614866&amp;clcid>

Expert from Word to the Wise explains that using a seed list testing service can reveal if your IP is pre-blacklisted and assist in monitoring deliverability during IP warming.

Documentation from Google Postmaster Tools underlines the importance of monitoring your IP's reputation using their tools, as this directly impacts deliverability to Gmail users (and provides insight into general reputation).

Documentation from Microsoft Documentation states that new IPs have no sending history, so it's crucial to establish a positive reputation by gradually increasing sending volume and maintaining good sender practices.

Documentation from RFC Documentation explains the importance of adhering to SMTP standards for email formatting, as non-compliant emails are more likely to be flagged as spam.

Documentation from SparkPost recommends a phased approach to IP warming, starting with low volumes and gradually increasing, while monitoring deliverability and engagement metrics.