What are your mailing class options? Each check request sent through Lob will be mailed as USPS First Class. USPS Standard Mail is not available for checks. Related articles Is it possible to add a logo to my check via the dashboard? How long until my mail is delivered? Can Lob prevent a check from being deposited? When I send a check, does Lob debit funds from my account? Does Lob's Check Service work with foreign bank accounts?