If you use a custom domain with MailSlurp and have periodic failures or 530 error messages from major providers like Yahoo and Gmail the MX records for your domain are likely misconfigured.

Investigating causes

Most email receiving issues that occur on MailSlurp are due to misconfigured domain name records.

A 530 failed to deliver error typically means you are using the private MX record. This record is not for public use and will fail. Please use only the record for your domain and no other MX records.

First check the DNS records on your domain. Using a terminal and you can fetch the records like so:

You should have one MX record only with the value:

Note period at the end of the name and record is required (if your DNS settings allow it) and is valid for DNS server names and records.

Additional causes

If you create inboxes that use a subdomain your account must be manually configured. Please contact support in this case.