[TYPO3] web form error message Warning: gethostbyaddr()

[oneilch]

Could some please help me get rid of this error:
Warning: gethostbyaddr() [function.gethostbyaddr]:
Address is not a valid IPv4 or IPv6 address in
/htdocs/typo3/typo3_src-4/t3lib/class.t3lib_htmlmail.php
on line 274

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