Somewhere in your email programme buried in the preferences/options is a section called Signatures.
A signature (or SIG) is a standard bit of text added to the end of your email. If you set up a sig then every new email for that account will have the sig automatically added to the bottom of the message. If you have more than one email account each account can have its own sig set up.
If you have a personal email then you can define any sig you like, from the sublime to the ridiculous.
For personal accounts a sig can be a bit of fun. For business accounts they are a must.
The golden rule of any business is that you market and promote your business at every opportunity. If you have your own domain name why are you sending emails from Hotmail or Googlemail (advertising someone else’s company!) when every email you send could be an advertisement for your own company?
If you have a business then it is a good idea to have a standard sig for all your emails (sales@..., info@..., contact@... etc.). Though you will have to configure the sig for each account you can COPY and PASTE the information in from one account to another.
A sig can include images as well as text, so it is a good idea to have the company logo and its motto as well as the web address and maybe even your position within the company.
Images should be kept small as they take up a lot more “size” than plain text, and no one wants an email that takes 5 minutes to download!
Also it is a good idea to save them as GIF, JPG or PNG. If your logo is fairly simple with defined blocks of colour (e.g. a cartoon) then a GIF is probably the best format. More detailed artwork (e.g. photographs or complex colour blocks) will look best as a JPG or PNG.
The difference between JPG and PNG files is that PNG supports transparency. A JPG image will always have a background (usually white by default) but a PNG will permit an “invisible” background. JPG files are slightly smaller than PNGs so are generally the preferred choice.
Do NOT use BMP, WMV or ART files as not every computer will be able to read them. And you do want everyone to know about your business don’t you?
Usually during the build of a site I will have a copy of that site’s logo and if you want me to create a logo for a sig then just ask.