The official maintainence guide for Mail-in-a-box can be found here
Note: You should always make regular backups of files.
- If you have just created/bought a domain and setup Main-in-a-box to be your mail server but realise that all of your emails are going to spam, this may help you out.
- An A record alone is not sufficient for your mail server. You need several TXT records so that GMail or any other email provider can verify the integrity of your mail server. DMARC, DKIM need a TXT record each.
- Consider using many free online tools to check your emails. email-tester is a popular online tool that i use often.