Hack: archive of mails sent from phone for custom domain

I am going to try hard to keep this as simple as possible. I have the following accounts I wish to check on my phone:

• Gmail
• Yahoo
• Custom domain email address (shreeni.info) with provider only supporting POP/SMTP

The second complication is this - I have been using my Gmail interface for both my gmail and the shreeni.info account, which means the inbox and the sent items are all merged, making searches much more easier.

Now, I wanted to fetch all of this on my phone retaining every aspect:

• Check all email accounts
• All replies should appear as coming from the account to which it was addressed to (so, gmail should not appear as the replier to shreeni.info mails)
• I should still be able to search for all shreeni.info and gmail mails on the web interface if I wished to, which is quite often, in a merged manner (meaning not searching on two different places.)

Complications:

• Continuing to use gmail as a proxy for shreeni.info meant that all responses from shreeni.info go as gmail.com address since the phone doesn't have an option which says "reply from same account as received", which the gmail web interface has.
• Using shreeni.info as an independent account on the phone makes the replies look as required, but the sent messages are unsearchable since they are only on the phone and not in the gmail server as I desire.

Options:

• BCC all mails from shreeni.info to gmail.com and use some sort of a filter to put it in. But it doesn't work for two reasons - my phone doesn't have a option of selectively BCCing. Its either for all accounts or none. Secondly, gmail doesn't have a way of specifying bcc: as a parameter to a filter, which is rather disappointing.
• (Actual Solution): After configuring all accounts, go the shreeni.info account on the phone, go to outgoing servers and in "Alternate SMTP servers" section, you should see the Gmail SMTP server. Turn that on. In the same page, turn off the default SMTP server of the shreeni.info account.

Now, all messages out of this account will be routed through the gmail smtp server and hence will appear on the web interface as if you sent it from there. Search works is as is. The only minor complication is for messages coming into gmail through the shreeni.info account which might be read twice, once directly and once through gmail when it fetches the same emails. For that, I just marked them as "skip inbox" and hence I read them only once.

I know it is a complicated situation and I know I am finicky about some things which others may not care, but I have a hunch more people will be trying to solve the same problem and hence this post.