To help with this, i do need to have screenshots/links more info to troubleshoot and see what exactly is the issue with the spacing/email so that i can suggest as well
without any information, i wouldn't be able to advise here.
Moreover, you can also directly contact HubSpot support.You can click on the help button added at the bottom right and directly share the client ID with support. They will surely help you with the right and best possible solution right away.
Hope this helps!
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Spacing between lines in sent email is different than when creating
For us, what we've kind of done is look at our historical data and used that as a defining "event" for how we do our spacing. We are consumer and not business targeting. So, historically, other platforms (non-Outlook) are the most used. So, we tend to format for what the greatest audience is using for reading.
That being said, we try to make it look as best we can, for all. If your predominant reader is a business person and they use Outlook, then reducing the spacing to the minimum, seems to acheive the greatest form, for business readers.
Again, it's nothing really that HS has any control over, but is an Outlook issue. They started this years ago and re-engineering Outlook would be a nightmare, I'm sure. Now, if you had someone that can really code, you might be able to do something that identifies an Outlook client and then formats specifically for that. But, not even sure if that can or would work and for what cost in time and $$.
Spacing between lines in sent email is different than when creating
Assuming that you're probably looking at your email in Outlook? If this is the case, you're most likely out of luck. Outlook has been a bane on HS forever..... Remember that Outlook doesn't read and format native HTML, but actually uses Word as its backend editor and viewer. And it doesn't do a very good job of it either.
Otherwise there is a line spacing menu drop down, in the email editor that you can adjust your line height. Again, this typically displays correctly for every email viewer, except Outlook.