Google Workspace email sending name suspensions arise from various factors, including compromised accounts, domain spoofing, policy violations, poor list hygiene, and improper email authentication. Resolving suspensions involves immediate actions like disabling compromised addresses, conducting security sweeps, and reviewing outbound mail activity. Long-term prevention requires maintaining a clean email list, implementing proper authentication protocols (SPF, DKIM, DMARC), monitoring sender reputation, adhering to sending limits, avoiding spam trigger words, and preventing abuse through security measures and user education. Regularly checking the Google Admin console and utilizing tools like MXToolbox for blacklist checks are also recommended.