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Comments
mxguarddog, might work.
or
https://www.junkemailfilter.com/spam/free_mx_backup_service.html
https://kisolabs.com/products/BackupMXFree
@jar will guide better
If you happen to have accounts with more than one provider, can't this be done by yourself?
im using a own vps with more domains and domains
but my vps provider has been suffering a lot of DDoS attacks in the last week so incoming mails don't arrive on time and are lost
You may be interested in our free hosted mailcow plan: https://www.hosmatic.com/p/mailserver
Please note that the free mail plan requires identity verification via. stripe to prevent abuse.