when you have been emailing somebody for a pretty long time like maybe a month or two when this is an established partner you can start using acronyms and I use a lot of them for example FYI for your information for your information for instance you have this email and you wanted to add something and you're like FYI I'll be in London the next week maybe we should meet for a coffee so this is like an addition to your email if there is something urgent I would encourage every single employee linguage trip always to put ASAP
in the subject of an email so that a person who's checking their emails would see that there is an urgent email that requires a very urgent answer ASAP as soon as possible