Items unacceptable for the Letter-post service include:

• Small packets
• Goods
• Film, audio, or video recordings (for example, diskettes, CDs, or DVDs)
• Unsealed self-mailers and envelopes
• Items prohibited by law or defined as dangerous goods in Canada or in the destination country (see Non-mailable matter or International destination listing for more information)

Items unacceptable when attached to a postcard include:

• Photographs
• Cuttings of any kind
• Fold-back sheets
• Other items that stick out or are in raised relief