"Invalid Email Address" - Joomla! Forum - community, help and support

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my website keeps coming "invalid email address" whether wants place order or ask question. business , livelyhood , busy season (school year - music stuff) very, frustrating problem!!! please help!  thanks.

take deep breath,  perhaps can if can give more details (but not limited to):

server spec (linux or windows)
joomla version
extensions
where , when error happening (contact us, registration, check out, etc)
what choices action error message give.

and forth, urgency.





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