In this guide, we will discover some possible causes that can cause too many transitions in the smtp diagnostic code with error 554 5.4.0 and then I will give some possible fixes that you can try to solve this problem.
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g.In general, there may be more trips (up to 10 or 15) depending on the configuration of the sender and recipient SMTP servers. To avoid such “loops”, most mail servers suppress email (also called bounce) when there are now 20 or more “hops”. Error 554 5.4. 0 is used to help you identify such a situation.
Lesson “Too many means referrals” that the most important letter went through several mail servers before being rejected by the last one. This means you set the bounce threshold too low, or the En email got stuck in a loop. if, for example, a user has two accounts and sends messages to each other, this can lead to an infinite loop.