I'm in the same boat.  I've received an email requiring me to 'confirm' my email address.  I've been with yahoo for a decade+.  Mail has been reliable, solid and steady... the fedora mailing lists are the ONLY ones where I periodically get warnings about too many 'bounces'.  I was pleasantly suprised to see someone else identifying the issue.


From: staticsafe <me@staticsafe.ca>
To: users@lists.fedoraproject.org
Sent: Friday, April 19, 2013 10:18 PM
Subject: Re: I've stopped receiving mail from fedora users

On 4/19/2013 19:41, Geoffrey Leach wrote:
> On 04/19/2013 11:11:58 AM, Sherman Grunewagon wrote:
>> For the past few days I've stopped receiving e-mail from the fedora
>> list.
>>
>> I' checked my fedora membership mailing list config and found this:
>>
>>    We have received some recent bounces from your address.  Your
>> current bounce score is 3.0 out of a maximum of 5.0.
>>    Please double check that your subscribed address is correct and
>> that there are no problems with delivery to this address.
>>    Your bounce score will be automatically reset if the problems are
>> corrected soon.
>>
>> I can't see anything out of order on my ymail.com account profile.
>> (I've changed nothing.)
>>
>> There are no filters and no blocking set. I really don't know what to
>> do at this point. Who should I contact and what else should I check?
>
> Log into your membership options at https://admin.fedoraproject.org/
> mailman/options/users and check the Mail delivery option.
>
> FWIW for me this is a major annoyance, as it happens every few months.
> Requests to the list administrator for details (so that whatever the
> problem is might be corrected) have gone unanswered.
>

That sounds like your mail provider is having deliverability issues, I
would contact them about it.

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