Recently active topics in Ping.fm tagged with email

all emails sent to my gmail plus-addressing address (username+ping@gmail.com) set to auto-forward to my ping.fm address never appear as updates. I think the problem may be that gmail does not replace the "to:" header on the email so it still shows "to: username+ping@gmail.com." Can anything be done about this?

I am sure I am missing something really obvious, but is there a way to post via e-mail without a trigger? Basically, I'm getting an RSS feed e-mail and I want to just redirect it to ping. When I try it, nothing happens. It also might be good to get an email response saying there was a failure attempting an e-mail post.

How do I send an e-mail message to trigger a Ping.fm update? I see a link on my dashboard, but it doesn't take me anywhere that helps me to understand how to make this work.

Thanks,
Jim.

how can i change my email posting address? (I can an automated email forward here and its screwing up posts- want to remove it)

I sometimes get:

Vodafone MMS-to-Email Service

You have received a message from mobile number +4477717*****

Subject: You have received a new message

In front of an email message from my phone. But not every time.

what picture formats are okay to post? and what format does the email need to be? for example, If I take a screenshot, and save it as say, screenshot.png, how do I email it to ping.fm?
Does the text of the post go as the subject of the email? or the body? Can I just attach the pic or does it need to be inline?
I tried to email a .png file 3 different times, it never posted... The text did though.

a valid e-mail address?

--
ANALYSIS:

(some) Valid e'mail addresses are rejected.

system rejects valid e'mail addresses,
in particular those of the form localA+localB@domain.

It is legitimate and even a well-used convention to have
a "+" in the local-part of an e'mail address.

In RFC 2822 you will see that the local-part of an e'mail
address can contain:
digits, letters [a-zA-Z] (yes, you have to preserve case!),
! # $ % & ' * + - / = ? ^ _ ` { | } ~, and _internal_ "."s.

cf http://tools.ietf.org/html/rfc3696