Sent 22/4 to 6/5 but received 22/5

[#1]

Three emails were delayed as per thread title, and source info is as per attachment.
Is there any clue within the info why the delay occurred, and in any way could it be down to my settings?

[#2]

It looks very much like they were delayed within Yahoo's network for a month
B.

[#3]

The following header line makes me think it's a moderated group and the mod was asleep/on holiday/lazy/forgot/etc.
X-eGroups-Approved-By: m_d_marlowe <michael.marlow@gmail.com> via web; 22 May 2009 02:23:41 -0000
Mike