If you’ve been keeping up with the blog in the last few months, you’ve probably noticed us talk about email bounces and email bounce rates a lot. These are negative metrics that senders face every day, so we figured it would be good to give a little insight into them. There are two types of bounces: soft bounces and hard bounces.
Many of our customers run large-scale digital marketing applications on top of Mailgun for their own customers. For example, Vero and Userfox are email service providers that built their awesome digital marketing automation apps on top of Mailgun
It has become clear from our support logs that a lot of developers use Action Mailer to send emails. If you are one of these developers you should know that there is one issue that we have seen repeatedly which will cause your emails to get filtered as spam by Gmail: malformed message-ID. This also may occur with other libraries but we see this issue mostly with Action Mailer.
It’s always fun chatting with customers about what they like about Mailgun (and what they’d like to see improved ).
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