17.11. Encoding
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## 17.11. Encoding

Text and HTML message bodies are encoded with the quotedprintable mechanism by default. All other attachments are encoded via base64 if no other encoding is given in the `addAttachment()` call or assigned to the MIME part object later. 7Bit and 8Bit encoding currently only pass on the binary content data.

`Zend_Mail_Transport_Smtp` encodes lines starting with one dot or two dots so that the mail does not violate the SMTP protocol.

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17.10. Character Sets | Principal | 17.12. SMTP Authentication