I'm curious about how companies that send out 100,000 to 150,000 emails a day set up and manage their own SMTP infrastructure. What software stacks do they typically use, like Listmonk with Postfix? What specific configurations do they implement? Additionally, where do they usually source their servers from, and what specifications do they prefer? I'm also interested in their strategies for IP warming.
4 Answers
It's rare to see companies handling their own SMTP at such volumes. Major players like SendGrid, Mailchimp, or HubSpot dominate the market. For anyone looking to warm up IPs, the process is key. Start with the highest quality emails that get opened and clicked—begin with around 3,000 per day on a dedicated IP and gradually increase. Mailchimp even offers a streamlined process for this!
Honestly, most high-volume senders use established mail vendors. They handle the tricky parts, like reputation management and deliverability. Sending 150k emails a day is actually manageable with a basic setup, since email systems are designed to absorb some delays. The real challenge is getting recipient servers to accept your emails.
When you're sending that much, it’s not just about the software stack but also focus on deliverability hygiene, managing sender reputation, and effectively handling bounces. Knowing whether you're mainly sending transactional emails or marketing campaigns can also change your approach!
I've had experience with a setup involving about 300 outbound SMTP servers. It was challenging managing sender reputation, especially with IPs having baggage from previous users. Implementing DMARC and DKIM was essential, and we had a system that updated SPF records dynamically. Even with best practices, some issues persist, especially with blacklist management.
That sounds like a nightmare! I can imagine dealing with past reputations must be a hassle. Have you tried any specific services to help with that?