Apoorva, as Email Invalid is standard field, you can not map directly. Instead update another custom field based Email Invalid data and send the custom field info to SFDC.
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As Kapil said, you have to create a new custom field in SFDC that syncs to Marketo, then populate that field with the same information that Marketo has for email invalid. This can be done using 2 smart campaigns.
1 (Batch) Smart list: email invalid = True; Flow: Change Data Value: [your new email invalid field] = true
2 (Triggered) Trigger: data value changes = email invalid (new value: true); Flow: Change Data Value: [your new email invalid field] = true
There's also a third campaign that I would advise, so that you can update email addresses and remove them from email invalid status:
3 (Triggered) Trigger: data value changes = email address, Filter: email invalid = true; Flow: change data value: Email invalid = false, change data value: [your new email invalid field] = false
I would also advise making this a field that cannot be updated in SFDC. Let Marketo handle the "unchecking" of the field by an actual email address change, not just someone unchecking the email invalid field.