Hi Terrence,
I’m Agathe, MailerSend’s project manager.
We’re sorry to hear you’ve encountered an error while attempting to send via SMTP. I haven’t been able to find your account, would you mind sending an email to [email protected] so we can check?
We recommend you run through some troubleshooting steps to resolve this as usually this type of problem can happen for the following reasons:
Wrong username or password: these fields are both case-sensitive, so you need to make sure both are exactly as shown in your account and that your provider is not changing them to lowercase or uppercase.
Sender email address: ensure the ‘from’ address you have opted to use matches the domain you’ve verified in your MailerSend account and is entered in lowercase.
Security settings: if you are testing MailerSend’s SMTP using a local client, you’ll need to make sure you do not have a firewall blocking the connection. You might find you need to set your firewall software to allow SMTP sending using port 587.
I hope that helps, but please feel free to let us know if you continue to have problems.
Regards,
Agathe.
