Hi - I'm looking for some advice.

I send emails from my domain successfulresumes.co.nz to gmail accounts of clients.  The majority are fine even with attachments.

Emails contain a link to our web address and a link to our logo held on imagur

Setting is html

Hosting company is Freeparking who also host the email - they say it's nothing to do with them.

I'm using Thunderbird email on my PC to send.

As I say, most emails get through fine, but a handful don't.  A common factor is attachments, but they are the same attachments that others receive without a problem. It's hard for me to know what the client has set at their end.  One has said the email  was in their spam after I asked her to look.

Can anyone identify why some might get through and some not?  There's a limit to what I can ask clients because some are not that tech savvy.  I would like to do what I can at my end, e.g. avoid certain words etc.  I realise links are not ideal, but since some are getting through I assume that is not the problem.

Any thoughts?

Jo