[SM-USERS] faulty email contents or an issue ?

I get certain email from a particular sender that have a header as below, and, that display as below: am I correct to say it's sender's fault as mail has HTML only contents, and, should included text/plain part ? thanks for any advice! they render OK on mobile, but, not in SM --

Re: [SM-USERS] faulty email contents or an issue ?

On Tue, March 16, 2021 6:58 am, Voytek Eymont via squirrelmail-users wrote: > I get certain email from a particular sender that have a header as below, > and, that display as below: > > am I correct to say it's sender's fault as mail has HTML only contents, > and, should included text/plain part