# Email charset - invalid byte sequence in UTF-8

**URL:** <https://www.ruby-forum.com/t/email-charset-invalid-byte-sequence-in-utf-8/180014>\
**Category:** Rails\
**Created:** [December 9, 2009, 5:51pm UTC](https://www.ruby-forum.com/t/email-charset-invalid-byte-sequence-in-utf-8/180014 "2009-12-09T17:51:27Z")\
**Posts on this page:** 1\
**Page:** 1

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**Author:** ![artchrst](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/a/e36b37/32.png) [@artchrst](https://www.ruby-forum.com/u/artchrst)\
**Post date:** [December 9, 2009, 5:51pm UTC](https://www.ruby-forum.com/t/email-charset-invalid-byte-sequence-in-utf-8/180014/1 "2009-12-09T17:51:27Z")

</div>

Hi Guys,

I’m using action\_mail to deliver a big5 charset email (but using  
“…”.encode(“big5”) in the .erb.

However, it returned invalid byte sequence in UTF-8 string.

How can I force it to use big5 in action mailer?

Thanks,  
Arthur