As agencies get their IT security act together, many now are okay with receiving excerpts as .doc/.docx attachments. Most US agents seem however to be stuck in the 20th century with their "pasted only" mindset, whereas most UK agents accept attachments.
In gmail, copy/pasting from Word retains most of the source formatting--indents, line spacing, fonts, italics, etc.--with just a few tweaks needed. Then drafts of queries, synopses, and excerpts can be saved within gmail for later customisation and reuse--huge time-saver.
HOWEVER, many agents have moved to the dreaded querymanager.com submission system. I say "dreaded" because pasting from Word into the querymanager synopsis, query, or excerpt fields mangles or omits altogether the source formatting. Everything is smooshed into an ugly, cramped sans serif font, and the surviving formatting must laboriously be checked, if not redone entirely, wasting huge amounts of a writer's time. Sadly, few agents' querymanager pages accept uploaded document files.
This matters a lot to me because I use different embedded fonts to demarcate between main and fantasy character POVs, plus archaic and rune fonts to add story-relevant flavour and mystery. querymanager.com's forms destroy all that.