Multiple Mail-Servers https://liferay.dev/c/message_boards/find_thread?p_l_id=119785294&threadId=121219648 2026-04-06T17:31:14Z 2026-04-06T17:31:14Z Olaf Kock https://liferay.dev/c/message_boards/find_message?p_l_id=119785294&messageId=121224096 2021-10-30T14:57:02Z 2021-10-30T14:57:01Z

<p>This sounds like you're using custom code to send notifications. And as you mention &quot;quite big customer&quot;: Do you run a cluster? Do you make sure that a mail is only sent once, from one machine?</p> <p>As Liferay configures a single SMTP server: how are those 7 servers configured? Is that DNS-round-robin? Other clustering? Do you use APIs to provide your own mail server when you send a notification?<br /> <br /> ​​​​​​​The article you link doesn't look like it contains the information that you're after.</p>

Olaf Kock 2021-10-30T14:57:01Z Fredi B https://liferay.dev/c/message_boards/find_message?p_l_id=119785294&messageId=121219647 2021-10-27T06:04:17Z 2021-10-27T05:58:42Z

<p>Hey Liferay-Community,</p> <p>while I - myself - think Liferays way of switching away from true Open-Source to Open-Source with documentation hidden behind paywalls ( https://help.liferay.com/hc/en-us/articles/4406443538829-Configure-Mail-Server-and-SMTP-to-get-email-notifications ) is a bad decision and has no real future, I hope I can find someone in the community, that can bring some light in the - for me - very dark SMTP-Server-Knowledge world.</p> <p>We are using com.liferay.mail.kernel.service.MailServiceUtil to send Notification E-Mails. Our quite big customer is using 7 Mail-Servers that sometimes / occasionally send the same mail multiple times to the same recipient (not wanted).</p> <p>When debugging that issue we can not reproduce with only one Mailserver nor find a hint that there are multiple sendEmail()-Calls when using multiple Mailservers.</p> <p>Has anyone else came across that problem?</p> <p>Liferay 7.3.5</p>

Fredi B 2021-10-27T05:58:42Z