Resolves #42339: Text-Mails are wrong

git-svn-id: https://svn.typo3.org/TYPO3v4/Extensions/sr_sendcard/trunk@83926 735d13b6-9817-0410-8766-e36946ffe9aa
Add warning in TS constants and manual regarding domain of site email address

git-svn-id: https://svn.typo3.org/TYPO3v4/Extensions/sr_sendcard/trunk@83927 735d13b6-9817-0410-8766-e36946ffe9aa
Enable in TYPO3 6.2

git-svn-id: https://svn.typo3.org/TYPO3v4/Extensions/sr_sendcard/trunk@83928 735d13b6-9817-0410-8766-e36946ffe9aa