php – PHPMailer w/SMTP to MailGun after a few hundred emails, get error: 451 Failed to parse header: malformed data; unexpected EOF

Using PHPMailer v 6.6.0 with SMTP to MailGun running PHP 7.4.28 & MySQL. The below code is in a foreach loop generating over 1,000 emails. Can send emails locally (using PHPMailer) without issue, but when sending externally via SMTP to MailGun, after a hundred or more emails have been sent, will have an SMTP communication … Read more

digital ocean – Postfix receives but don’t send emails on DigitalOcean droplet

As I was following the tutorial (https://www.digitalocean.com/community/tutorials/how-to-install-and-configure-postfix-on-ubuntu-18-04) I established postfix mail server. By the way unfortunately a can’t send e-mails anywhere outside my droplet. According to logs I receive status: status=bounced (host healthqode.me[127.0.1.1] said: 554 Here is the last log data: sudo tail -f /var/log/mail.log Apr 25 11:15:26 healthqode postfix/submission/smtpd[26048]: connect from localhost.localdomain[127.0.0.1] Apr 25 … Read more