Hi @muhammed_suhaile_, please see my comments inline:
Question:
As many email clients such as Outlook don't download images by default, if someone open their email without downloading or clicking to download all images, does Marketo will be able to capture Open activity?
Answer:
In Case of Outlook, As you said, Outlook doesn't download images by default. So Marketo will not capture Open until images are downloaded. Marketo will capture open when the user clicks on download all images or change the setting in outlook to automatically download pictures.
Question:
Is it possible for Marketo to record Open Activity in an email we sent without any images?
Answer:
Yes, Marketo makes an addition to your email before sending it. That is Adding of an invisible image to track opens. When a recipient views an email, their email client retrieves the invisible image from Marketo's servers.This triggers an Open Email event.
Question:
I'd like to understand how Marketo capture Open Activity with invisible tracking pixel image?
Answer:
When a recipient views an email, their email client retrieves the invisible image from Marketo's servers. This triggers an Open Email event, no matter how long or short the view was. An Open Email event also occurs when a lead clicks the "View as web page" link in an email. Only one email open event is tracked regardless of the number of times a lead views the email.
If User email clients block images that will prevent Marketo from tracking the open events.
Due to Marketo's distributed architecture, email open events may be delayed a couple of minutes between when the event occurs and when they appear in the lead's activity log.
Tip for getting better tracking stats on your emails:
Include an image in your emails (like a logo) so the recipient is encouraged to enable images to see your message.
Thanks,
Disha