diff --git a/Troubleshooting-Mail.md b/Troubleshooting-Mail.md
index 1ef9601..d02ef78 100644
--- a/Troubleshooting-Mail.md
+++ b/Troubleshooting-Mail.md
@@ -1,8 +1,8 @@
 ## MAIL_SERVICE
 
-Wekan v5.52 and newer:
+a) If you use smtps or smtp, please do not add any MAIL_SERVICE settings. For example, AWS SES and Postfix works with only MAIL_URL and MAIL_FROM.
 
-If you don't use `smtp://` or `smtps://` for sending email, you can instead use MAIL_SERVICE settings of [Well Known email services](https://nodemailer.com/smtp/well-known/) that are these:
+b) If smtps or smtp does not work, in Wekan v5.52 and newer, you can try these additional MAIL_SERVICE settings. This may still also require MAIL_URL to be valid, while it only uses MAIL_SERVICE settings of [Well Known email services](https://nodemailer.com/smtp/well-known/) that are these:
 
 126, 163, 1und1, AOL, DebugMail, DynectEmail, FastMail, GandiMail, Gmail, Godaddy, GodaddyAsia, GodaddyEurope, hot.ee, Hotmail, iCloud, mail.ee, Mail.ru, Maildev, Mailgun, Mailjet, Mailosaur, Mandrill, Naver, OpenMailBox, Outlook365, Postmark, QQ, QQex, SendCloud, SendGrid, SendinBlue, SendPulse, SES, SES-US-EAST-1, SES-US-WEST-2, SES-EU-WEST-1, Sparkpost, Yahoo, Yandex, Zoho, qiye.aliyun