"Most email providers route early-stage companies through shared servers alongside hundreds of other senders. At low volume, this works fine. But as a company grows, it becomes more exposed to what everyone else on those servers is doing."
"Mailbox providers do not see 'transactional' and 'marketing' as separate categories. They see one sender. When a promotional email gets ignored or flagged, that poor engagement drags down deliverability for everything the company sends."
"Q1 2025 data from deliverability researchers tells a stark story: senders pushing more than one million messages a month saw average inbox placement rates fall to 27.63 percent."
"Scale, without the right architecture underneath it, actively works against you."
As SaaS companies grow, their email infrastructure often becomes the most fragile aspect of their product. Initially, shared servers work well for low volumes, but as user accounts increase, issues arise from shared resources. Problems include password reset emails landing in junk folders due to spam complaints from other senders. Additionally, sending all email types through the same setup leads to poor engagement affecting deliverability. Data shows that senders exceeding one million messages monthly experience significantly reduced inbox placement rates, highlighting the need for robust email architecture as companies scale.
Read at London Business News | Londonlovesbusiness.com
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