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-rw-r--r--docs/URL-SYNTAX.md2
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diff --git a/docs/URL-SYNTAX.md b/docs/URL-SYNTAX.md
index a7cd5a68d..7892aa611 100644
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@@ -314,6 +314,8 @@ and specifying this path allows you to set an alternative name, such as your
machine's fully qualified domain name, which you might have obtained from an
external function such as gethostname or getaddrinfo.
+The default smtp port is 25. Some servers use port 587 as an alternative.
+
## RTMP
There's no official URL spec for RTMP so libcurl uses the URL syntax supported