Why is ZeptoMail listed on Spamhaus, and does it hurt deliverability?

Large email services share IP addresses across many senders, so an address can occasionally appear on a blocklist because of another sender's behaviour. Whether it affects you depends on which list, which IP and how long it stays listed. Check the specific IP that sent your mail, set up SPF, DKIM and DMARC properly, and contact ZeptoMail support with the details if you see bounces.

ZeptoMail is Zoho's transactional email service for password resets, receipts and notifications. Like other providers, it sends from pools of IP addresses. If one customer on a shared pool sends unwanted mail, an IP can be listed for a period while the provider deals with it. Spamhaus has several different lists, and not all of them mean the same thing, so look at which list and why.

Check the headers of a bounced or delayed message to find the sending IP, then look it up on the blocklist. If it is listed, send the details to ZeptoMail support so they can investigate and move your traffic if needed. If it is not listed, the problem is more likely your domain's authentication or content.

Your own setup matters most. Make sure SPF includes ZeptoMail, DKIM is signed with your domain, and DMARC is published. Send only transactional mail, not marketing, through ZeptoMail. Keep bounce rates low by removing invalid addresses. Watch your domain reputation through mailbox provider tools. High-volume senders can ask about dedicated IPs.

Written by Flowpeak, a Zoho implementation partner. Zoho pricing and features change, so confirm current details on the official Zoho site. Free checklists | Ask us a question