Section 906 Certifications - --------------------------- I, Charles E. Porter, a principal executive officer of the Funds listed on Attachment A, certify that, to my knowledge: 1. The form N-CSR of the Funds listed on Attachment A for the period ended June 30, 2004 fully complies with the requirements of Section 13(a) or 15(d) of the Securities Exchange Act of 1934; and 2. The information contained in the Form N-CSR of the Funds listed on Attachment A for the period ended June 30, 2004 fairly presents, in all material respects, the financial condition and results of operations of the Funds listed on Attachment A. /s/Charles E. Porter Date: August 30, 2004 - ---------------------- ------------------------ Charles E. Porter, Principal Executive Officer Section 906 Certifications - --------------------------- I, Steven D. Krichmar, the principal financial officer of the Funds listed on Attachment A, certify that, to my knowledge: 1. The form N-CSR of the Funds listed on Attachment A for the period ended June 30, 2004 fully complies with the requirements of Section 13(a) or 15(d) of the Securities Exchange Act of 1934; and 2. The information contained in the Form N-CSR of the Funds listed on Attachment A for the period ended June 30, 2004 fairly presents, in all material respects, the financial condition and results of operations of the Funds listed on Attachment A. /s/Steven D. Krichmar Date: August 30, 2004 - ---------------------- ------------------------ Steven D. Krichmar, Principal Financial Officer Attachment A - -------------- Period(s) ended June 30, 2004 057 Putnam Europe Equity Fund 2CE Putnam International Growth and Income Fund 2HF Putnam Small Cap Growth Fund 377 Putnam Discovery Growth Fund 841 Putnam International Equity Fund 852 Putnam New Opportunities Fund Putnam Variable Trust includes: 2PX Putnam VT American Government Income Fund 2TP Putnam VT Capital Appreciation Fund 961 Putnam VT Diversified Income Fund 2IS Putnam VT The George Putnam Fund of Boston 070 Putnam VT Global Asset Allocation Fund 016 Putnam VT Global Equity Fund 066 Putnam VT Growth and Income Fund 2PU Putnam VT Growth Opportunities Fund 2IW Putnam VT Health Sciences Fund 067 Putnam VT High Yield Fund 068 Putnam VT Income Fund 2DO Putnam VT International Equity Fund 2DN Putnam VT International Growth and Income Fund 2DP Putnam VT International New Opportunities Fund 2IO Putnam VT Investors Fund 069 Putnam VT Money Market Fund 098 Putnam VT New Opportunities Fund 2DR Putnam VT New Value Fund 2IP Putnam VT OTC & Emerging Growth Fund 2LA Putnam VT Research Fund 2MJ Putnam VT Small Cap Value Fund 152 Putnam VT Utilities Growth and Income Fund 2DQ Putnam VT Vista Fund 065 Putnam VT Voyager Fund 2TJ Putnam VT Discovery Growth 23N Putnam VT Equity Income Fund 23K Putnam VT Capital Opportunities Fund 23H Putnam VT Mid Cap Value Fund