[Hecl-devel] Undelivered Mail Returned to Sender

[<MAI...@pr...>]

This is the Postfix program at host mail.prs.de.

I'm sorry to have to inform you that the message returned
below could not be delivered to one or more destinations.

For further assistance, please send mail to <postmaster>

If you do so, please include this problem report. You can
delete your own text from the message returned below.

			The Postfix program

<hec...@li...>: host mail.sourceforge.net[66.35.250.206]
    said: 451-Could not complete sender verify callout 451-Could not complete
    sender verify callout for 451-<hec...@li...>. 451-The
    mail server(s) for the domain may be temporarily unreachable, or 451-they
    may be permanently unreachable from this server. In the latter case,
    451-you need to change the address or create an MX record for its domain
    451-if it is supposed to be generally accessible from the Internet. 451
    Talk to your mail administrator for details.