The default iPhone signature "Sent from my iPhone" is perceived by many as disclaimer for possible errors, lack of depth, clarity and information in emails People are more than likely to give you the benefit of doubt and attribute the shortcomings in your emails to the limited capacity that you are operating from – Tiny Screen, onscreen keyboard and "on the go" settingsPerhaps you should edit the email signature on your device An email signature is a block of text at the end of emails that represents who you are It is a quick and effective way to let others know who they are emailing and how to contact youThere, modify the signature for all mail accounts you have set up, or on a peraccountbasis
How To Add Email Signatures Per Account In The Mail App Appletoolbox