Before anything else, one test tells you where the problem is: sign in to webmail and try sending from there.
If webmail works but your app doesn't
The mailbox is fine — the problem is in the app's settings. Almost always one of these three:
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Wrong password — the mailbox password is not your cPanel or portal password. Reset it in cPanel → Email Accounts → Manage.
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Wrong ports — must be IMAP 993 and SMTP 465, both with SSL/TLS. See the setup guides for your app.
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Username incomplete — it has to be the full address (you@yourdomain.co.mz), not just the part before the @.
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If webmail doesn't work either
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Check the password by resetting it in cPanel — then try webmail again.
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Check the mailbox isn't full. In cPanel → Email Accounts, a mailbox at 100% of its quota stops receiving. Delete old mail or raise the quota.
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Sending works, receiving doesn't
This is almost always DNS: the domain's MX records aren't pointing here. If you recently changed nameservers or use an external DNS provider, the mail is being delivered somewhere else. Check with how to check a domain's DNS.
Your messages arrive in the recipient's spam folder
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Send from the real address of the domain, not a forwarded or spoofed one.
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Avoid sending the same message to large lists from a normal mailbox — that is what triggers spam filters.
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If it persists, open a ticket: we can check whether the domain or the server IP is on a blocklist.
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Recently changed the DNS? Give it time before assuming a fault — see how long DNS changes take. During that window, some mail may still be delivered to the old server.
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