Helo command rejected: need fully-qualified hostname, can't add SMTP · Issue #1054 · Foundry376/Mailspring · GitHub
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/001_what-does-fqdn-mean-2625883-5c05cb5fc9e77c00010d6438.jpg "Definition of FQDN (Fully Qualified Domain Name)")
Definition of FQDN (Fully Qualified Domain Name)
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