Missing messages to list

Every now and then, messages posted to my mailing list don’t reach everyone.
Someone commented they sometimes see a message that is a reply to a message
from the list they hadn’t received. I’ve seen this happen too. I keep a
couple of addresses subscribed and every now and then check the other. This
evening, I found 4 messages sent this afternoon that reached my yahoo
account but not my home account. A later message today reached me fine. The
missing mails aren’t in my sp@m folder. Someone else mentioned they hadn’t
had mails from the list for ages, then suddenly some recent ones reached
him.

It seems an intermittent problem and worries me as it means some of us are
missing out. And it’s unpredictable. Has been happening a long time – at
least a year.

I googled “missing messages majordomo” and found one thread saying it could
be to do with queueing. I haven’t a clue what this is so don’t know how to
establish if this is the cause nor what to do about it.

What do you think may be happening?
How can I sort it out?

I can bet I’ll get no-where with my host provider – anything I ask about
majordomo gets the answer along the lines of, “This is a scripting problem.
We do not provide support for scripting.”

So I’d value your help with diagnosis and treatment.

Thanks

Clare