Problem sending email to all lists

About 30 minutes ago I sent an email to our prospect list, guest list, member list, and former members list. The email included a jpeg file embeded in the email and an attached PDF. I have my personal email on the guest list for test purposes. My husband's email is also on the guest list. The email was delivered to my personal address right away, but my husband has not yet received it. I also haven't received the email in the email account that I use for Toastmasters. I sent the email using a separate gmail account that our club use to answer emails (info@downtoearthtoastmasters.com), which is listed as an "other officer" on the website, specifically so we can send emails to all of the lists from this account. I've checked my spam folder and the message isn't there. What could the problem be?

The first attachment is of the sent email. The second attachment is of the email I received in my personal email account.

We'll need your club number before we can investigate further.

Have you been able to send email successfully like this, previously?

A few minutes after I posted this, I received the following email in our info@downtoearthtoastmasters.com inbox. Maybe it's just taking awhile to get the email sent to all (several hundred) recipients?

[FreeToastHost] Message Not Delivered: You're invited: Down to Earth Toastmasters is turning 20!

FreeToastHost Server

Your message to (​rockchalkph@gmail.com in guests-4630@toastmastersclubs.org) had the following error and was not delivered (11 retries):
no recipients [] Failures=[] Recipients=[]
NOTE: This may be due to an invalid recipient address or high email volume at this time--try again later.

Club number is 4630.

Yes, we use it to send emails to former guests and former members about twice a year.

That is an issue with that account at gmail. your emails are going through.

How can you tell? I still haven't received the email at my member email address and my husband hasn't received the email either.