I’ve set up a standard footer for all my emails, and the footer includes my company’s logo. Sometimes, I reply to emails and note that my logo doesn’t appear in the response—all the receiver sees is text. Why is this, and what can I do about it?
Not all email content is equivalent, as you’ve seen. Most email client applications (and Web-based email hosts) support rich content in email messages: Things like logos and graphics, multiple fonts and text colors, all appear both in your email as you compose it and when it’s received. Amazingly, some do not. Some email applications require text-only email content, and for this reason, most email clients allow you to create email that can only contain text. In addition, most email clients are configured so that when you reply to an email, the reply uses the same formatting options as the original email: If you reply to a text-only email message, your response will most likely also be text only.
When you include rich text (graphics, and so on) in your email message, you’re most likely using HTML formatting (like a Web page uses) to create the content. (Some email clients support rich-text formatting using a different format, but not all, and we don’t recommend anything other than HTML for sending formatted emails.) If your email client has been configured to respond to the email message using the same format in which it was sent, or if your email client has been configured to only allow text-only email messages, you can modify the settings and allow HTML formatting and rich text. (Note that email editors that allow you to create “stationery”, so that your emails look like fancy paper, also use some sort of HTML formatting, in general. For business use, please do your best to avoid this feature—it’s strictly for personal use.)
Ken balks at using graphics in a footer, mostly because in most email clients, that graphic appears in the list of messages as an attachment; this makes it impossible to determine by glancing at a list of emails which ones actually have attachments, and which have a graphic embedded in a footer. It’s up to you, of course, and it’s not really the topic of this question, but do think about whether it’s worth including a non-essential graphic in every email you send—it certainly clutters up the recipient’s inbox with things that look like attachments, but really aren’t.
For more information on the differences between plain text and HTML-formatted emails, check out this link: https://goo.gl/7O9TUA.