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I also get the same error (in Chrome) when testing a forged email: telnet learndmarc.com 25 Trying 87.239.13.42... Connected to learndmarc.com. Escape
by jrockway 3y ago
I also get the same error (in Chrome) when testing a forged email:
telnet learndmarc.com 25
Trying 87.239.13.42...
Connected to learndmarc.com.
Escape character is '^]'.
220 allspark.uriports.com ESMTP URIports Mail Portal 1.03.2 Sun, 01 Oct 2023 21:55:40 +0000
HELO there
250 allspark.uriports.com Hello <my host> [<ip address>]
MAIL From: me@example.com
250 OK
RCPT To: ld-49101f55f6@learndmarc.com
250 Accepted
DATA
354 Enter message, ending with "." on a line by itself
.
250 OK id=1qn4QF-00CUhd-5j
It's funny because while I was typing this, it's like "you don't have to write a love letter". Maybe not, but you do have to repeat the From: and To: header in the data segment, I guess.
I remain amused at how much email I've sent over the years with "HELO there" instead of my hostname in there. I also wonder what % of internet traffic is "Enter message, ending with . on a line by itself".