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I have used MailGun, which was the first place I ever saw this great technology. I mean the technology where I see who opened the email and when.<br />
<br />
As far as your #1 option, please explain this to me. It sounds very interesting...<br />
<br />
As far as your #2, it seems this would be useful only when URL's are the same in a single email. Otherwise, they are by default unique.<br />
<br />
But what does either of these have to do with Open Rates? How would the recipient be moved to open an email with either a 1X1 pixel image or unique URL's??
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I have used MailGun, which was the first place I ever saw this great technology. I mean the technology where I see who opened the email and when.

As far as your #1 option, please explain this to me. It sounds very interesting...

As far as your #2, it seems this would be useful only when URL's are the same in a single email. Otherwise, they are by default unique.

But what does either of these have to do with Open Rates? How would the recipient be moved to open an email with either a 1X1 pixel image or unique URL's??

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You're welcome.<br />
<br />
Give Drip a try also, this may be sufficient + cheap enough for your project.
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You're welcome.

Give Drip a try also, this may be sufficient + cheap enough for your project.

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I use a CRM which has the nice feature of showing what emails were viewed, and when they were viewed.<br />
<br />
Does this exist with ThunderBird? Or is there some other email client I can use that has this?<br />
<br />
Thanks.
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I use a CRM which has the nice feature of showing what emails were viewed, and when they were viewed.

Does this exist with ThunderBird? Or is there some other email client I can use that has this?

Thanks.

ThunderBird: Any way to see what Sent emails have been viewed?

An email client, email reader or more formally mail user agent (MUA) is a computer program in the category of groupware environments used to access and manage a user's email. A web application that provides message management, composition, and reception functions may internally act as an email client; as a whole, it is commonly referred to as webmail. Likewise, email client may be referred to a piece of computer hardware or software whose primary or most visible role is to work as an email client. Email clients can also have other systems, like calendars, notes and contact managers.

Email Clients

Thunderbird is an email, newsgroup, news feed, and chat (XMPP, IRC, Twitter) client that supports POP and IMAP and LDAP address completion. The vanilla version is not a personal information manager, although the Mozilla Lightning extension adds PIM functionality. Thunderbird can manage multiple email, newsgroup, and news feed accounts and supports multiple identities within accounts. Features such as quick search, saved search folders, advanced message filtering, message grouping, and labels help manage and find messages. Thunderbird incorporates a Bayesian spam filter, a whitelist based on the included address book, and can also understand classifications by server-based filters such as SpamAssassin. Extensions allow the addition of features.

Thunderbird

Within Internet message handling services (MHS), a message transfer agent or mail transfer agent (MTA) or mail relay is software that transfers electronic mail messages from one computer to another using a client–server application architecture. A MTA implements both the client (sending) and server (receiving) portions of the Simple Mail Transfer Protocol (SMTP). The terms mail server, mail exchanger, and MX host may also refer to a computer performing the MTA function. The Domain Name System (DNS) associates a mail server to a domain with mail exchanger (MX) resource records containing the domain name of a host providing MTA services.

Email Servers

Interactions between email servers and clients are governed by email protocols. The three most common email protocols are POP, IMAP and MAPI. Most email software operates under one of these (and many products support more than one).  The correct protocol must be selected, and correctly configured, if you want your email account to work.

Email Protocols

An email client, email reader or more formally mail user agent (MUA) is a computer program used to access and manage a user's email. A web application that provides message management, composition, and reception functions is sometimes also considered an email client, but more commonly referred to as webmail.