What’s the difference between internal vs external bounce parsing?

Internal bounce parsing handles classification yourself:

Advantages:

Full control over classification logic. Custom rules for your specific needs. No dependency on third parties. Complete data visibility.

Challenges:

Requires expertise to build and maintain. Must track evolving provider patterns. Resource-intensive development.

External bounce parsing delegates to ESPs or services:

Advantages:

Maintained by specialists. Continuously updated dictionaries. Less development effort. Often more accurate.

Challenges:

Less control over classification. May not match your specific needs. Data flows through third party.

Hybrid approach:

Use ESP parsing as baseline. Override or supplement with custom rules. Best of both worlds.

Internal parsing gives control; external gives convenience. Choose based on your resources and needs.